diff --git a/dialog/backend/__init__.py b/dialog/backend/__init__.py
index be655ef..07951ce 100644
--- a/dialog/backend/__init__.py
+++ b/dialog/backend/__init__.py
@@ -1,11 +1,12 @@
-from pathlib import Path
-
-from flask import Flask, send_from_directory
+from flask import Flask, send_from_directory, request, jsonify, session
 
 from .config import PROJECT_ROOT
 from .routes.chat import bp as chat_bp
 from .routes.faq import bp as faq_bp
 from .routes.conversation import bp as convo_bp
+from .routes.auth import bp as auth_bp
+from .config import SECRET_KEY
+from .admin import ensure_admin_file
 
 
 def create_app():
@@ -16,11 +17,31 @@ def create_app():
         template_folder=str(dist_dir),
     )
 
+    app.secret_key = SECRET_KEY
+
+    # 确保管理员文件存在（仅存储哈希）
+    ensure_admin_file()
+
     # 注册路由
+    app.register_blueprint(auth_bp)
     app.register_blueprint(chat_bp)
     app.register_blueprint(faq_bp)
     app.register_blueprint(convo_bp)
 
+    @app.before_request
+    def require_login():
+        # 仅保护 API，登录接口与静态资源除外
+        path = request.path or ""
+        if request.method == "OPTIONS":
+            return None
+        if path.startswith("/api/auth"):
+            return None
+        if not path.startswith("/api"):
+            return None
+        if session.get("user"):
+            return None
+        return jsonify({"error": "未登录"}), 401
+
     # 前端静态资源 & SPA 回退
     @app.route("/", defaults={"path": ""})
     @app.route("/<path:path>")
diff --git a/dialog/backend/admin.py b/dialog/backend/admin.py
new file mode 100644
index 0000000..a7f5a48
--- /dev/null
+++ b/dialog/backend/admin.py
@@ -0,0 +1,38 @@
+import json
+from pathlib import Path
+from typing import Optional
+
+from werkzeug.security import generate_password_hash, check_password_hash
+
+from .config import DATA_DIR
+
+ADMIN_PATH = DATA_DIR / "admin.json"
+DEFAULT_USERNAME = "cxf"
+DEFAULT_PASSWORD = "NianJie1018"
+
+
+def ensure_admin_file(username: str = DEFAULT_USERNAME, password: str = DEFAULT_PASSWORD) -> None:
+    """Create admin file with hashed password if missing."""
+    if ADMIN_PATH.exists():
+        return
+    data = {
+        "username": username,
+        "password_hash": generate_password_hash(password),
+    }
+    ADMIN_PATH.write_text(json.dumps(data, ensure_ascii=False, indent=2), encoding="utf-8")
+
+
+def get_admin() -> Optional[dict]:
+    if not ADMIN_PATH.exists():
+        return None
+    try:
+        return json.loads(ADMIN_PATH.read_text(encoding="utf-8"))
+    except Exception:
+        return None
+
+
+def verify_credentials(username: str, password: str) -> bool:
+    admin = get_admin()
+    if not admin:
+        return False
+    return username == admin.get("username") and check_password_hash(admin.get("password_hash", ""), password)
diff --git a/dialog/backend/config.py b/dialog/backend/config.py
index b3a852a..93289c4 100644
--- a/dialog/backend/config.py
+++ b/dialog/backend/config.py
@@ -5,6 +5,9 @@ from pathlib import Path
 BASE_DIR = Path(__file__).resolve().parent
 PROJECT_ROOT = BASE_DIR.parent
 
+# Flask session
+SECRET_KEY = os.getenv("SECRET_KEY", "dev-secret-change-me")
+
 # 数据文件
 DATA_DIR = PROJECT_ROOT / "data"
 DATA_DIR.mkdir(parents=True, exist_ok=True)
diff --git a/dialog/backend/routes/auth.py b/dialog/backend/routes/auth.py
new file mode 100644
index 0000000..4d8f029
--- /dev/null
+++ b/dialog/backend/routes/auth.py
@@ -0,0 +1,35 @@
+from flask import Blueprint, jsonify, request, session
+
+from ..admin import verify_credentials, get_admin
+
+bp = Blueprint("auth", __name__, url_prefix="/api/auth")
+
+
+@bp.post("/login")
+def login():
+    data = request.get_json(force=True, silent=True) or {}
+    username = (data.get("username") or "").strip()
+    password = data.get("password") or ""
+    if not username or not password:
+        return jsonify({"error": "用户名和密码必填"}), 400
+
+    if not verify_credentials(username, password):
+        return jsonify({"error": "用户名或密码错误"}), 401
+
+    session["user"] = username
+    return jsonify({"username": username})
+
+
+@bp.post("/logout")
+def logout():
+    session.clear()
+    return jsonify({"ok": True})
+
+
+@bp.get("/me")
+def me():
+    user = session.get("user")
+    if not user:
+        return jsonify({"error": "未登录"}), 401
+    admin = get_admin() or {}
+    return jsonify({"username": user, "role": "admin", "has_admin": bool(admin)})
diff --git a/dialog/frontend/package-lock.json b/dialog/frontend/package-lock.json
index 0b8d8b7..6740798 100644
--- a/dialog/frontend/package-lock.json
+++ b/dialog/frontend/package-lock.json
@@ -12,8 +12,8 @@
         "vue": "^3.5.24"
       },
       "devDependencies": {
-        "@vitejs/plugin-vue": "^6.0.1",
-        "vite": "^7.2.4"
+        "@vitejs/plugin-vue": "^4.5.2",
+        "vite": "^4.5.5"
       }
     },
     "node_modules/@babel/helper-string-parser": {
@@ -62,27 +62,10 @@
         "node": ">=6.9.0"
       }
     },
-    "node_modules/@esbuild/aix-ppc64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.2.tgz",
-      "integrity": "sha512-GZMB+a0mOMZs4MpDbj8RJp4cw+w1WV5NYD6xzgvzUJ5Ek2jerwfO2eADyI6ExDSUED+1X8aMbegahsJi+8mgpw==",
-      "cpu": [
-        "ppc64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "aix"
-      ],
-      "engines": {
-        "node": ">=18"
-      }
-    },
     "node_modules/@esbuild/android-arm": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.2.tgz",
-      "integrity": "sha512-DVNI8jlPa7Ujbr1yjU2PfUSRtAUZPG9I1RwW4F4xFB1Imiu2on0ADiI/c3td+KmDtVKNbi+nffGDQMfcIMkwIA==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.18.20.tgz",
+      "integrity": "sha512-fyi7TDI/ijKKNZTUJAQqiG5T7YjJXgnzkURqmGj13C6dCqckZBLdl4h7bkhHt/t0WP+zO9/zwroDvANaOqO5Sw==",
       "cpu": [
         "arm"
       ],
@@ -93,13 +76,13 @@
         "android"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/android-arm64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.27.2.tgz",
-      "integrity": "sha512-pvz8ZZ7ot/RBphf8fv60ljmaoydPU12VuXHImtAs0XhLLw+EXBi2BLe3OYSBslR4rryHvweW5gmkKFwTiFy6KA==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.18.20.tgz",
+      "integrity": "sha512-Nz4rJcchGDtENV0eMKUNa6L12zz2zBDXuhj/Vjh18zGqB44Bi7MBMSXjgunJgjRhCmKOjnPuZp4Mb6OKqtMHLQ==",
       "cpu": [
         "arm64"
       ],
@@ -110,13 +93,13 @@
         "android"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/android-x64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.27.2.tgz",
-      "integrity": "sha512-z8Ank4Byh4TJJOh4wpz8g2vDy75zFL0TlZlkUkEwYXuPSgX8yzep596n6mT7905kA9uHZsf/o2OJZubl2l3M7A==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.18.20.tgz",
+      "integrity": "sha512-8GDdlePJA8D6zlZYJV/jnrRAi6rOiNaCC/JclcXpB+KIuvfBN4owLtgzY2bsxnx666XjJx2kDPUmnTtR8qKQUg==",
       "cpu": [
         "x64"
       ],
@@ -127,13 +110,13 @@
         "android"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/darwin-arm64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.27.2.tgz",
-      "integrity": "sha512-davCD2Zc80nzDVRwXTcQP/28fiJbcOwvdolL0sOiOsbwBa72kegmVU0Wrh1MYrbuCL98Omp5dVhQFWRKR2ZAlg==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.18.20.tgz",
+      "integrity": "sha512-bxRHW5kHU38zS2lPTPOyuyTm+S+eobPUnTNkdJEfAddYgEcll4xkT8DB9d2008DtTbl7uJag2HuE5NZAZgnNEA==",
       "cpu": [
         "arm64"
       ],
@@ -144,13 +127,13 @@
         "darwin"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/darwin-x64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.27.2.tgz",
-      "integrity": "sha512-ZxtijOmlQCBWGwbVmwOF/UCzuGIbUkqB1faQRf5akQmxRJ1ujusWsb3CVfk/9iZKr2L5SMU5wPBi1UWbvL+VQA==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.18.20.tgz",
+      "integrity": "sha512-pc5gxlMDxzm513qPGbCbDukOdsGtKhfxD1zJKXjCCcU7ju50O7MeAZ8c4krSJcOIJGFR+qx21yMMVYwiQvyTyQ==",
       "cpu": [
         "x64"
       ],
@@ -161,13 +144,13 @@
         "darwin"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/freebsd-arm64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.27.2.tgz",
-      "integrity": "sha512-lS/9CN+rgqQ9czogxlMcBMGd+l8Q3Nj1MFQwBZJyoEKI50XGxwuzznYdwcav6lpOGv5BqaZXqvBSiB/kJ5op+g==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.18.20.tgz",
+      "integrity": "sha512-yqDQHy4QHevpMAaxhhIwYPMv1NECwOvIpGCZkECn8w2WFHXjEwrBn3CeNIYsibZ/iZEUemj++M26W3cNR5h+Tw==",
       "cpu": [
         "arm64"
       ],
@@ -178,13 +161,13 @@
         "freebsd"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/freebsd-x64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.27.2.tgz",
-      "integrity": "sha512-tAfqtNYb4YgPnJlEFu4c212HYjQWSO/w/h/lQaBK7RbwGIkBOuNKQI9tqWzx7Wtp7bTPaGC6MJvWI608P3wXYA==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.18.20.tgz",
+      "integrity": "sha512-tgWRPPuQsd3RmBZwarGVHZQvtzfEBOreNuxEMKFcd5DaDn2PbBxfwLcj4+aenoh7ctXcbXmOQIn8HI6mCSw5MQ==",
       "cpu": [
         "x64"
       ],
@@ -195,13 +178,13 @@
         "freebsd"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-arm": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.27.2.tgz",
-      "integrity": "sha512-vWfq4GaIMP9AIe4yj1ZUW18RDhx6EPQKjwe7n8BbIecFtCQG4CfHGaHuh7fdfq+y3LIA2vGS/o9ZBGVxIDi9hw==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.18.20.tgz",
+      "integrity": "sha512-/5bHkMWnq1EgKr1V+Ybz3s1hWXok7mDFUMQ4cG10AfW3wL02PSZi5kFpYKrptDsgb2WAJIvRcDm+qIvXf/apvg==",
       "cpu": [
         "arm"
       ],
@@ -212,13 +195,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-arm64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.27.2.tgz",
-      "integrity": "sha512-hYxN8pr66NsCCiRFkHUAsxylNOcAQaxSSkHMMjcpx0si13t1LHFphxJZUiGwojB1a/Hd5OiPIqDdXONia6bhTw==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.18.20.tgz",
+      "integrity": "sha512-2YbscF+UL7SQAVIpnWvYwM+3LskyDmPhe31pE7/aoTMFKKzIc9lLbyGUpmmb8a8AixOL61sQ/mFh3jEjHYFvdA==",
       "cpu": [
         "arm64"
       ],
@@ -229,13 +212,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-ia32": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.27.2.tgz",
-      "integrity": "sha512-MJt5BRRSScPDwG2hLelYhAAKh9imjHK5+NE/tvnRLbIqUWa+0E9N4WNMjmp/kXXPHZGqPLxggwVhz7QP8CTR8w==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.18.20.tgz",
+      "integrity": "sha512-P4etWwq6IsReT0E1KHU40bOnzMHoH73aXp96Fs8TIT6z9Hu8G6+0SHSw9i2isWrD2nbx2qo5yUqACgdfVGx7TA==",
       "cpu": [
         "ia32"
       ],
@@ -246,13 +229,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-loong64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.27.2.tgz",
-      "integrity": "sha512-lugyF1atnAT463aO6KPshVCJK5NgRnU4yb3FUumyVz+cGvZbontBgzeGFO1nF+dPueHD367a2ZXe1NtUkAjOtg==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.18.20.tgz",
+      "integrity": "sha512-nXW8nqBTrOpDLPgPY9uV+/1DjxoQ7DoB2N8eocyq8I9XuqJ7BiAMDMf9n1xZM9TgW0J8zrquIb/A7s3BJv7rjg==",
       "cpu": [
         "loong64"
       ],
@@ -263,13 +246,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-mips64el": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.27.2.tgz",
-      "integrity": "sha512-nlP2I6ArEBewvJ2gjrrkESEZkB5mIoaTswuqNFRv/WYd+ATtUpe9Y09RnJvgvdag7he0OWgEZWhviS1OTOKixw==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-mips64el/-/linux-mips64el-0.18.20.tgz",
+      "integrity": "sha512-d5NeaXZcHp8PzYy5VnXV3VSd2D328Zb+9dEq5HE6bw6+N86JVPExrA6O68OPwobntbNJ0pzCpUFZTo3w0GyetQ==",
       "cpu": [
         "mips64el"
       ],
@@ -280,13 +263,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-ppc64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.27.2.tgz",
-      "integrity": "sha512-C92gnpey7tUQONqg1n6dKVbx3vphKtTHJaNG2Ok9lGwbZil6DrfyecMsp9CrmXGQJmZ7iiVXvvZH6Ml5hL6XdQ==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ppc64/-/linux-ppc64-0.18.20.tgz",
+      "integrity": "sha512-WHPyeScRNcmANnLQkq6AfyXRFr5D6N2sKgkFo2FqguP44Nw2eyDlbTdZwd9GYk98DZG9QItIiTlFLHJHjxP3FA==",
       "cpu": [
         "ppc64"
       ],
@@ -297,13 +280,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-riscv64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.27.2.tgz",
-      "integrity": "sha512-B5BOmojNtUyN8AXlK0QJyvjEZkWwy/FKvakkTDCziX95AowLZKR6aCDhG7LeF7uMCXEJqwa8Bejz5LTPYm8AvA==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-riscv64/-/linux-riscv64-0.18.20.tgz",
+      "integrity": "sha512-WSxo6h5ecI5XH34KC7w5veNnKkju3zBRLEQNY7mv5mtBmrP/MjNBCAlsM2u5hDBlS3NGcTQpoBvRzqBcRtpq1A==",
       "cpu": [
         "riscv64"
       ],
@@ -314,13 +297,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-s390x": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.27.2.tgz",
-      "integrity": "sha512-p4bm9+wsPwup5Z8f4EpfN63qNagQ47Ua2znaqGH6bqLlmJ4bx97Y9JdqxgGZ6Y8xVTixUnEkoKSHcpRlDnNr5w==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-s390x/-/linux-s390x-0.18.20.tgz",
+      "integrity": "sha512-+8231GMs3mAEth6Ja1iK0a1sQ3ohfcpzpRLH8uuc5/KVDFneH6jtAJLFGafpzpMRO6DzJ6AvXKze9LfFMrIHVQ==",
       "cpu": [
         "s390x"
       ],
@@ -331,13 +314,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       }
     },
     "node_modules/@esbuild/linux-x64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.27.2.tgz",
-      "integrity": "sha512-uwp2Tip5aPmH+NRUwTcfLb+W32WXjpFejTIOWZFw/v7/KnpCDKG66u4DLcurQpiYTiYwQ9B7KOeMJvLCu/OvbA==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-x64/-/linux-x64-0.18.20.tgz",
+      "integrity": "sha512-UYqiqemphJcNsFEskc73jQ7B9jgwjWrSayxawS6UVFZGWrAAtkzjxSqnoclCXxWtfwLdzU+vTpcNYhpn43uP1w==",
       "cpu": [
         "x64"
       ],
@@ -348,30 +331,13 @@
         "linux"
       ],
       "engines": {
-        "node": ">=18"
-      }
-    },
-    "node_modules/@esbuild/netbsd-arm64": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/@esbuild/netbsd-arm64/-/netbsd-arm64-0.27.2.tgz",
-      "integrity": "sha512-Kj6DiBlwXrPsCRDeRvGAUb/LNrBASrfqAIok+xB0LxK8CHqxZ037viF13ugfsIpePH93mX7xfJp97cyDuTZ3cw==",
-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "netbsd"
-      ],
-      "engines": {
-        "node": ">=18"
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-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "win32"
-      ]
-    },
-    "node_modules/@rollup/rollup-win32-ia32-msvc": {
-      "version": "4.55.1",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-ia32-msvc/-/rollup-win32-ia32-msvc-4.55.1.tgz",
-      "integrity": "sha512-3fZBidchE0eY0oFZBnekYCfg+5wAB0mbpCBuofh5mZuzIU/4jIVkbESmd2dOsFNS78b53CYv3OAtwqkZZmU5nA==",
-      "cpu": [
-        "ia32"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "win32"
-      ]
-    },
-    "node_modules/@rollup/rollup-win32-x64-gnu": {
-      "version": "4.55.1",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-x64-gnu/-/rollup-win32-x64-gnu-4.55.1.tgz",
-      "integrity": "sha512-xGGY5pXj69IxKb4yv/POoocPy/qmEGhimy/FoTpTSVju3FYXUQQMFCaZZXJVidsmGxRioZAwpThl/4zX41gRKg==",
-      "cpu": [
-        "x64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "win32"
-      ]
-    },
-    "node_modules/@rollup/rollup-win32-x64-msvc": {
-      "version": "4.55.1",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-win32-x64-msvc/-/rollup-win32-x64-msvc-4.55.1.tgz",
-      "integrity": "sha512-SPEpaL6DX4rmcXtnhdrQYgzQ5W2uW3SCJch88lB2zImhJRhIIK44fkUrgIV/Q8yUNfw5oyZ5vkeQsZLhCb06lw==",
-      "cpu": [
-        "x64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "win32"
-      ]
-    },
-    "node_modules/@types/estree": {
-      "version": "1.0.8",
-      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
-      "integrity": "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/@vitejs/plugin-vue": {
-      "version": "6.0.3",
-      "resolved": "https://registry.npmjs.org/@vitejs/plugin-vue/-/plugin-vue-6.0.3.tgz",
-      "integrity": "sha512-TlGPkLFLVOY3T7fZrwdvKpjprR3s4fxRln0ORDo1VQ7HHyxJwTlrjKU3kpVWTlaAjIEuCTokmjkZnr8Tpc925w==",
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/@vitejs/plugin-vue/-/plugin-vue-4.6.2.tgz",
+      "integrity": "sha512-kqf7SGFoG+80aZG6Pf+gsZIVvGSCKE98JbiWqcCV9cThtg91Jav0yvYFC9Zb+jKetNGF6ZKeoaxgZfND21fWKw==",
       "dev": true,
       "license": "MIT",
-      "dependencies": {
-        "@rolldown/pluginutils": "1.0.0-beta.53"
-      },
       "engines": {
-        "node": "^20.19.0 || >=22.12.0"
+        "node": "^14.18.0 || >=16.0.0"
       },
       "peerDependencies": {
-        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0-0",
+        "vite": "^4.0.0 || ^5.0.0",
         "vue": "^3.2.25"
       }
     },
@@ -1010,9 +575,9 @@
       }
     },
     "node_modules/esbuild": {
-      "version": "0.27.2",
-      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.27.2.tgz",
-      "integrity": "sha512-HyNQImnsOC7X9PMNaCIeAm4ISCQXs5a5YasTXVliKv4uuBo1dKrG0A+uQS8M5eXjVMnLg3WgXaKvprHlFJQffw==",
+      "version": "0.18.20",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.18.20.tgz",
+      "integrity": "sha512-ceqxoedUrcayh7Y7ZX6NdbbDzGROiyVBgC4PriJThBKSVPWnnFHZAkfI1lJT8QFkOwH4qOS2SJkS4wvpGl8BpA==",
       "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
@@ -1020,35 +585,31 @@
         "esbuild": "bin/esbuild"
       },
       "engines": {
-        "node": ">=18"
+        "node": ">=12"
       },
       "optionalDependencies": {
-        "@esbuild/aix-ppc64": "0.27.2",
-        "@esbuild/android-arm": "0.27.2",
-        "@esbuild/android-arm64": "0.27.2",
-        "@esbuild/android-x64": "0.27.2",
-        "@esbuild/darwin-arm64": "0.27.2",
-        "@esbuild/darwin-x64": "0.27.2",
-        "@esbuild/freebsd-arm64": "0.27.2",
-        "@esbuild/freebsd-x64": "0.27.2",
-        "@esbuild/linux-arm": "0.27.2",
-        "@esbuild/linux-arm64": "0.27.2",
-        "@esbuild/linux-ia32": "0.27.2",
-        "@esbuild/linux-loong64": "0.27.2",
-        "@esbuild/linux-mips64el": "0.27.2",
-        "@esbuild/linux-ppc64": "0.27.2",
-        "@esbuild/linux-riscv64": "0.27.2",
-        "@esbuild/linux-s390x": "0.27.2",
-        "@esbuild/linux-x64": "0.27.2",
-        "@esbuild/netbsd-arm64": "0.27.2",
-        "@esbuild/netbsd-x64": "0.27.2",
-        "@esbuild/openbsd-arm64": "0.27.2",
-        "@esbuild/openbsd-x64": "0.27.2",
-        "@esbuild/openharmony-arm64": "0.27.2",
-        "@esbuild/sunos-x64": "0.27.2",
-        "@esbuild/win32-arm64": "0.27.2",
-        "@esbuild/win32-ia32": "0.27.2",
-        "@esbuild/win32-x64": "0.27.2"
+        "@esbuild/android-arm": "0.18.20",
+        "@esbuild/android-arm64": "0.18.20",
+        "@esbuild/android-x64": "0.18.20",
+        "@esbuild/darwin-arm64": "0.18.20",
+        "@esbuild/darwin-x64": "0.18.20",
+        "@esbuild/freebsd-arm64": "0.18.20",
+        "@esbuild/freebsd-x64": "0.18.20",
+        "@esbuild/linux-arm": "0.18.20",
+        "@esbuild/linux-arm64": "0.18.20",
+        "@esbuild/linux-ia32": "0.18.20",
+        "@esbuild/linux-loong64": "0.18.20",
+        "@esbuild/linux-mips64el": "0.18.20",
+        "@esbuild/linux-ppc64": "0.18.20",
+        "@esbuild/linux-riscv64": "0.18.20",
+        "@esbuild/linux-s390x": "0.18.20",
+        "@esbuild/linux-x64": "0.18.20",
+        "@esbuild/netbsd-x64": "0.18.20",
+        "@esbuild/openbsd-x64": "0.18.20",
+        "@esbuild/sunos-x64": "0.18.20",
+        "@esbuild/win32-arm64": "0.18.20",
+        "@esbuild/win32-ia32": "0.18.20",
+        "@esbuild/win32-x64": "0.18.20"
       }
     },
     "node_modules/estree-walker": {
@@ -1057,24 +618,6 @@
       "integrity": "sha512-Rfkk/Mp/DL7JVje3u18FxFujQlTNR2q6QfMSMB7AvCBx91NGj/ba3kCfza0f6dVDbw7YlRf/nDrn7pQrCCyQ/w==",
       "license": "MIT"
     },
-    "node_modules/fdir": {
-      "version": "6.5.0",
-      "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
-      "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=12.0.0"
-      },
-      "peerDependencies": {
-        "picomatch": "^3 || ^4"
-      },
-      "peerDependenciesMeta": {
-        "picomatch": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/fsevents": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
@@ -1123,19 +666,6 @@
       "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
       "license": "ISC"
     },
-    "node_modules/picomatch": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
-      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/jonschlinkert"
-      }
-    },
     "node_modules/postcss": {
       "version": "8.5.6",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.6.tgz",
@@ -1165,47 +695,19 @@
       }
     },
     "node_modules/rollup": {
-      "version": "4.55.1",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.55.1.tgz",
-      "integrity": "sha512-wDv/Ht1BNHB4upNbK74s9usvl7hObDnvVzknxqY/E/O3X6rW1U1rV1aENEfJ54eFZDTNo7zv1f5N4edCluH7+A==",
+      "version": "3.29.5",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-3.29.5.tgz",
+      "integrity": "sha512-GVsDdsbJzzy4S/v3dqWPJ7EfvZJfCHiDqe80IyrF59LYuP+e6U1LJoUqeuqRbwAWoMNoXivMNeNAOf5E22VA1w==",
       "dev": true,
       "license": "MIT",
-      "dependencies": {
-        "@types/estree": "1.0.8"
-      },
       "bin": {
         "rollup": "dist/bin/rollup"
       },
       "engines": {
-        "node": ">=18.0.0",
+        "node": ">=14.18.0",
         "npm": ">=8.0.0"
       },
       "optionalDependencies": {
-        "@rollup/rollup-android-arm-eabi": "4.55.1",
-        "@rollup/rollup-android-arm64": "4.55.1",
-        "@rollup/rollup-darwin-arm64": "4.55.1",
-        "@rollup/rollup-darwin-x64": "4.55.1",
-        "@rollup/rollup-freebsd-arm64": "4.55.1",
-        "@rollup/rollup-freebsd-x64": "4.55.1",
-        "@rollup/rollup-linux-arm-gnueabihf": "4.55.1",
-        "@rollup/rollup-linux-arm-musleabihf": "4.55.1",
-        "@rollup/rollup-linux-arm64-gnu": "4.55.1",
-        "@rollup/rollup-linux-arm64-musl": "4.55.1",
-        "@rollup/rollup-linux-loong64-gnu": "4.55.1",
-        "@rollup/rollup-linux-loong64-musl": "4.55.1",
-        "@rollup/rollup-linux-ppc64-gnu": "4.55.1",
-        "@rollup/rollup-linux-ppc64-musl": "4.55.1",
-        "@rollup/rollup-linux-riscv64-gnu": "4.55.1",
-        "@rollup/rollup-linux-riscv64-musl": "4.55.1",
-        "@rollup/rollup-linux-s390x-gnu": "4.55.1",
-        "@rollup/rollup-linux-x64-gnu": "4.55.1",
-        "@rollup/rollup-linux-x64-musl": "4.55.1",
-        "@rollup/rollup-openbsd-x64": "4.55.1",
-        "@rollup/rollup-openharmony-arm64": "4.55.1",
-        "@rollup/rollup-win32-arm64-msvc": "4.55.1",
-        "@rollup/rollup-win32-ia32-msvc": "4.55.1",
-        "@rollup/rollup-win32-x64-gnu": "4.55.1",
-        "@rollup/rollup-win32-x64-msvc": "4.55.1",
         "fsevents": "~2.3.2"
       }
     },
@@ -1218,23 +720,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/tinyglobby": {
-      "version": "0.2.15",
-      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
-      "integrity": "sha512-j2Zq4NyQYG5XMST4cbs02Ak8iJUdxRM0XI5QyxXuZOzKOINmWurp3smXu3y5wDcJrptwpSjgXHzIQxR0omXljQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "fdir": "^6.5.0",
-        "picomatch": "^4.0.3"
-      },
-      "engines": {
-        "node": ">=12.0.0"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/SuperchupuDev"
-      }
-    },
     "node_modules/uuid": {
       "version": "13.0.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-13.0.0.tgz",
@@ -1249,51 +734,41 @@
       }
     },
     "node_modules/vite": {
-      "version": "7.3.1",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-7.3.1.tgz",
-      "integrity": "sha512-w+N7Hifpc3gRjZ63vYBXA56dvvRlNWRczTdmCBBa+CotUzAPf5b7YMdMR/8CQoeYE5LX3W4wj6RYTgonm1b9DA==",
+      "version": "4.5.14",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-4.5.14.tgz",
+      "integrity": "sha512-+v57oAaoYNnO3hIu5Z/tJRZjq5aHM2zDve9YZ8HngVHbhk66RStobhb1sqPMIPEleV6cNKYK4eGrAbE9Ulbl2g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "esbuild": "^0.27.0",
-        "fdir": "^6.5.0",
-        "picomatch": "^4.0.3",
-        "postcss": "^8.5.6",
-        "rollup": "^4.43.0",
-        "tinyglobby": "^0.2.15"
+        "esbuild": "^0.18.10",
+        "postcss": "^8.4.27",
+        "rollup": "^3.27.1"
       },
       "bin": {
         "vite": "bin/vite.js"
       },
       "engines": {
-        "node": "^20.19.0 || >=22.12.0"
+        "node": "^14.18.0 || >=16.0.0"
       },
       "funding": {
         "url": "https://github.com/vitejs/vite?sponsor=1"
       },
       "optionalDependencies": {
-        "fsevents": "~2.3.3"
+        "fsevents": "~2.3.2"
       },
       "peerDependencies": {
-        "@types/node": "^20.19.0 || >=22.12.0",
-        "jiti": ">=1.21.0",
-        "less": "^4.0.0",
+        "@types/node": ">= 14",
+        "less": "*",
         "lightningcss": "^1.21.0",
-        "sass": "^1.70.0",
-        "sass-embedded": "^1.70.0",
-        "stylus": ">=0.54.8",
-        "sugarss": "^5.0.0",
-        "terser": "^5.16.0",
-        "tsx": "^4.8.1",
-        "yaml": "^2.4.2"
+        "sass": "*",
+        "stylus": "*",
+        "sugarss": "*",
+        "terser": "^5.4.0"
       },
       "peerDependenciesMeta": {
         "@types/node": {
           "optional": true
         },
-        "jiti": {
-          "optional": true
-        },
         "less": {
           "optional": true
         },
@@ -1303,9 +778,6 @@
         "sass": {
           "optional": true
         },
-        "sass-embedded": {
-          "optional": true
-        },
         "stylus": {
           "optional": true
         },
@@ -1314,12 +786,6 @@
         },
         "terser": {
           "optional": true
-        },
-        "tsx": {
-          "optional": true
-        },
-        "yaml": {
-          "optional": true
         }
       }
     },
diff --git a/dialog/frontend/package.json b/dialog/frontend/package.json
index 8c112d8..76fadad 100644
--- a/dialog/frontend/package.json
+++ b/dialog/frontend/package.json
@@ -13,7 +13,7 @@
     "vue": "^3.5.24"
   },
   "devDependencies": {
-    "@vitejs/plugin-vue": "^6.0.1",
-    "vite": "^7.2.4"
+    "@vitejs/plugin-vue": "^4.5.2",
+    "vite": "^4.5.5"
   }
 }
diff --git a/dialog/frontend/src/App.vue b/dialog/frontend/src/App.vue
index 2497aff..af54c22 100644
--- a/dialog/frontend/src/App.vue
+++ b/dialog/frontend/src/App.vue
@@ -1,5 +1,5 @@
 <template>
-  <div class="app-shell">
+  <div v-if="user" class="app-shell">
     <aside class="sidebar">
       <div class="sidebar-header">
         <div class="logo">念界客服</div>
@@ -21,7 +21,13 @@
     <main class="chat-pane">
       <header class="topbar">
         <div class="title">{{ mode === 'faq' ? '快速问答（不计入记录）' : 'AI 客服' }}</div>
-        <div class="status">{{ statusText }}</div>
+        <div class="top-actions">
+          <span class="status">{{ statusText }}</span>
+          <div class="account">
+            <span class="user-name">👤 {{ user.username }}</span>
+            <button class="ghost" @click="handleLogout">退出</button>
+          </div>
+        </div>
       </header>
 
       <section ref="logRef" class="chat-log">
@@ -82,11 +88,34 @@
       </footer>
     </main>
   </div>
+
+  <div v-else class="login-shell">
+    <div class="login-card">
+      <div class="logo">念界后台登录</div>
+      <p class="login-sub">请输入管理员账户</p>
+      <form @submit.prevent="handleLogin" class="login-form">
+        <label>用户名</label>
+        <input v-model="loginForm.username" placeholder="用户名" autocomplete="username" />
+        <label>密码</label>
+        <input v-model="loginForm.password" type="password" placeholder="密码" autocomplete="current-password" />
+        <div v-if="loginError" class="error">{{ loginError }}</div>
+        <button class="primary" type="submit" :disabled="loginLoading">{{ loginLoading ? '登录中...' : '登录' }}</button>
+      </form>
+    </div>
+  </div>
 </template>
 
 <script setup>
 import { ref, reactive, onMounted, nextTick, onBeforeUnmount } from 'vue';
-import { fetchTopQuestions, fetchQuestionById, searchQuestions, sendAiMessage } from './api';
+import {
+  fetchTopQuestions,
+  fetchQuestionById,
+  searchQuestions,
+  sendAiMessage,
+  login as loginApi,
+  logout as logoutApi,
+  fetchMe,
+} from './api';
 import { v4 as uuid } from 'uuid';
 
 const messages = ref([]);
@@ -100,11 +129,15 @@ const lastQuery = ref('');
 const suggestions = ref([]);
 const suggestionPage = ref(1);
 const logRef = ref(null);
+const user = ref(null);
+const loginForm = reactive({ username: '', password: '' });
+const loginError = ref('');
+const loginLoading = ref(false);
 const popStateHandler = () => {
   const id = parseConversationIdFromPath(window.location.pathname);
-  if (id) {
+  if (id && user.value) {
     loadConversation(id);
-  } else {
+  } else if (user.value) {
     resetFaq({ syncUrl: false });
   }
 };
@@ -129,7 +162,6 @@ function ensureUrlForConversation(id, { replace = false } = {}) {
 
 function format(text) {
   if (!text) return '';
-  // 支持既有真实换行，也支持字符串中的转义换行
   return text
     .replace(/\r?\n/g, '<br>')
     .replace(/\\n/g, '<br>');
@@ -172,14 +204,18 @@ function pushUser(text) {
 }
 
 async function handleSelectOption(opt) {
-  pushUser(opt.question);
-  const item = await fetchQuestionById(opt.id);
-  messages.value.push({
-    id: uuid(),
-    role: 'assistant',
-    content: item.answer || '',
-  });
-  scrollToBottom();
+  try {
+    pushUser(opt.question);
+    const item = await fetchQuestionById(opt.id);
+    messages.value.push({
+      id: uuid(),
+      role: 'assistant',
+      content: item.answer || '',
+    });
+    scrollToBottom();
+  } catch (err) {
+    if (err.code === 401) await onUnauthorized();
+  }
 }
 
 async function handleSend() {
@@ -190,10 +226,14 @@ async function handleSend() {
     lastQuery.value = text;
     pushUser(text);
     input.value = '';
-    const res = await searchQuestions(text);
-    suggestions.value = res.items || [];
-    suggestionPage.value = 1;
-    showSuggestionPage(1);
+    try {
+      const res = await searchQuestions(text);
+      suggestions.value = res.items || [];
+      suggestionPage.value = 1;
+      showSuggestionPage(1);
+    } catch (err) {
+      if (err.code === 401) await onUnauthorized();
+    }
   } else {
     await sendAi(text);
   }
@@ -238,7 +278,6 @@ async function sendAi(text) {
   statusText.value = 'AI 生成中';
   isStreaming.value = true;
 
-  // reactive 以确保流式增量更新到视图
   const aiMsg = reactive({ id: uuid(), role: 'assistant', type: 'ai', before: '', after: '', searching: false, searchDone: false });
   messages.value.push(aiMsg);
   scrollToBottom();
@@ -294,29 +333,38 @@ async function sendAi(text) {
       scrollToBottom();
     }
 
-    // 尾部剩余（可能是不完整帧），仅在能解析时处理
     const tail = buffer.trim();
     if (tail) {
       try { handleEvent(JSON.parse(tail)); } catch (e) { console.warn('parse tail err', e, tail); }
     }
   } catch (err) {
-    aiMsg.before = '出错了，请重试';
-    console.error(err);
+    if (err && err.code === 401) {
+      await onUnauthorized();
+      aiMsg.before = '未登录，请重新登录。';
+    } else {
+      aiMsg.before = '出错了，请重试';
+      console.error(err);
+    }
   } finally {
     isStreaming.value = false;
     statusText.value = '空闲';
-    loadConversations();
+    if (user.value) {
+      loadConversations();
+    }
   }
 }
 
 async function loadConversations() {
-  const res = await fetch('/api/conversations');
+  if (!user.value) return;
+  const res = await fetch('/api/conversations', { credentials: 'include' });
+  if (res.status === 401) { await onUnauthorized(); return; }
   if (!res.ok) return;
   conversations.value = await res.json();
 }
 
 async function loadConversation(id) {
-  const res = await fetch(`/api/conversations/${id}`);
+  const res = await fetch(`/api/conversations/${id}`, { credentials: 'include' });
+  if (res.status === 401) { await onUnauthorized(); return; }
   if (!res.ok) return;
   const data = await res.json();
   conversationId.value = data.id;
@@ -328,17 +376,14 @@ async function loadConversation(id) {
     const m = list[i];
     if (m.role === 'tool') continue;
 
-    // 将“搜索前 + 搜索完成 + 搜索后”合成一个气泡
     if (m.role === 'assistant' && Array.isArray(m.tool_calls) && m.tool_calls.length) {
       let after = '';
       let j = i + 1;
-      // 寻找紧随其后的最终回答（跳过 tool）
       while (j < list.length) {
         const next = list[j];
         if (next.role === 'tool') { j++; continue; }
         if (next.role === 'assistant' && (!next.tool_calls || next.tool_calls.length === 0)) {
           after = next.content || '';
-          // 已消费这个最终回答
           i = j;
         }
         break;
@@ -370,15 +415,56 @@ function toggleSidebar() {
   if (el) el.classList.toggle('open');
 }
 
-onMounted(() => {
-  loadConversations();
+async function onUnauthorized() {
+  user.value = null;
+  loginError.value = '';
+  isStreaming.value = false;
+  statusText.value = '空闲';
+  messages.value = [];
+  conversations.value = [];
+  conversationId.value = null;
+}
+
+async function handleLogin() {
+  loginError.value = '';
+  loginLoading.value = true;
+  try {
+    const res = await loginApi(loginForm.username.trim(), loginForm.password);
+    user.value = res;
+    await postLoginInit();
+  } catch (err) {
+    loginError.value = err.code === 401 ? '用户名或密码错误' : '登录失败，请稍后重试';
+  } finally {
+    loginLoading.value = false;
+  }
+}
+
+async function handleLogout() {
+  try { await logoutApi(); } catch (e) { /* ignore */ }
+  await onUnauthorized();
+}
+
+async function postLoginInit() {
+  await loadConversations();
   const idFromUrl = parseConversationIdFromPath(window.location.pathname);
   if (idFromUrl) {
     ensureUrlForConversation(idFromUrl, { replace: true });
-    loadConversation(idFromUrl);
+    await loadConversation(idFromUrl);
   } else {
     resetFaq({ syncUrl: false });
   }
+}
+
+onMounted(async () => {
+  try {
+    const me = await fetchMe();
+    user.value = me;
+  } catch (err) {
+    user.value = null;
+  }
+  if (user.value) {
+    await postLoginInit();
+  }
   window.addEventListener('popstate', popStateHandler);
 });
 
diff --git a/dialog/frontend/src/api.js b/dialog/frontend/src/api.js
index a8a8dbf..3f939a4 100644
--- a/dialog/frontend/src/api.js
+++ b/dialog/frontend/src/api.js
@@ -1,30 +1,69 @@
+async function request(url, { method = 'GET', body, headers = {} } = {}) {
+  const res = await fetch(url, {
+    method,
+    credentials: 'include',
+    headers: { 'Content-Type': 'application/json', ...headers },
+    body,
+  });
+  if (res.status === 401) {
+    const err = new Error('unauthorized');
+    err.code = 401;
+    throw err;
+  }
+  if (!res.ok) {
+    const err = new Error(`http ${res.status}`);
+    err.code = res.status;
+    throw err;
+  }
+  return res;
+}
+
 export async function fetchTopQuestions() {
-  const res = await fetch('/api/faq/top');
+  const res = await request('/api/faq/top');
   return res.json();
 }
 
 export async function fetchQuestionById(id) {
-  const res = await fetch(`/api/faq/item/${id}`);
-  if (!res.ok) throw new Error('not found');
+  const res = await request(`/api/faq/item/${id}`);
   return res.json();
 }
 
 export async function searchQuestions(query) {
-  const res = await fetch('/api/faq/search', {
+  const res = await request('/api/faq/search', {
     method: 'POST',
-    headers: { 'Content-Type': 'application/json' },
     body: JSON.stringify({ query }),
   });
   return res.json();
 }
 
 export async function sendAiMessage(text, conversationId = null) {
-  const res = await fetch('/api/chat', {
+  const res = await request('/api/chat', {
     method: 'POST',
-    headers: { 'Content-Type': 'application/json' },
     body: JSON.stringify({ message: text, conversation_id: conversationId }),
   });
-  if (!res.ok || !res.body) throw new Error('请求失败');
+  if (!res.body) {
+    const err = new Error('请求失败');
+    err.code = 'no-body';
+    throw err;
+  }
   const newId = res.headers.get('X-Conversation-Id');
   return { stream: res.body, conversationId: newId };
 }
+
+export async function login(username, password) {
+  const res = await request('/api/auth/login', {
+    method: 'POST',
+    body: JSON.stringify({ username, password }),
+  });
+  return res.json();
+}
+
+export async function logout() {
+  const res = await request('/api/auth/logout', { method: 'POST' });
+  return res.json();
+}
+
+export async function fetchMe() {
+  const res = await request('/api/auth/me');
+  return res.json();
+}
diff --git a/dialog/frontend/src/style.css b/dialog/frontend/src/style.css
index 28ecfcc..fea95fc 100644
--- a/dialog/frontend/src/style.css
+++ b/dialog/frontend/src/style.css
@@ -41,7 +41,10 @@ button.ghost { background: transparent; border: none; font-size: 18px; padding:
 .chat-pane { display: grid; grid-template-rows: auto 1fr auto; height: 100vh; }
 .topbar { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px 12px; }
 .topbar .title { font-weight: 600; font-size: 16px; }
+.top-actions { display: flex; align-items: center; gap: 12px; }
 .status { color: var(--muted); font-size: 13px; }
+.account { display: inline-flex; align-items: center; gap: 8px; padding: 6px 10px; background: #f1f5ff; border: 1px solid var(--border); border-radius: 10px; }
+.user-name { font-size: 13px; color: #0f2a5f; }
 
 .chat-log { padding: 12px 24px 24px; overflow-y: auto; display: flex; flex-direction: column; gap: 14px; }
 .message { display: inline-block; max-width: 70%; padding: 12px 14px; border-radius: var(--radius); background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow); line-height: 1.5; white-space: normal; word-break: break-word; }
@@ -86,3 +89,12 @@ button.ghost { background: transparent; border: none; font-size: 18px; padding:
   .chat-log .message { max-width: 100%; }
   .topbar { padding-right: 12px; }
 }
+
+.login-shell { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg); padding: 20px; }
+.login-card { width: 360px; background: #fff; border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); padding: 24px; display: flex; flex-direction: column; gap: 12px; }
+.login-card .logo { font-weight: 700; font-size: 20px; letter-spacing: 0.4px; }
+.login-sub { color: var(--muted); margin: 0 0 8px; }
+.login-form { display: flex; flex-direction: column; gap: 10px; }
+.login-form input { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); font-size: 14px; }
+.login-form input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(31,111,235,0.12); }
+.login-form .error { color: #c2410c; background: #fff3e8; border: 1px solid #f1c9a8; padding: 8px 10px; border-radius: 8px; font-size: 13px; }