diff --git a/README.md b/README.md
index 91cc228..1c0bbdb 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,11 @@
 - **static/**：Vue + Socket.IO 单页应用；`chat/monitor` 为虚拟显示器动画层。
 - **docker/**：终端镜像 Dockerfile 及工具容器依赖清单。
 
+重构后的主链路分层（2026-03）：
+- `core/main_terminal.py` + `core/main_terminal_parts/`（主终端入口 + 功能 mixin）
+- `server/chat_flow.py` + `server/chat_flow_runner.py` + `server/chat_flow_helpers.py`
+- `server/conversation.py` + `server/conversation_stats.py`
+
 更多目录说明请查阅 `tree -L 2` 或仓库内注释。
 
 ---
diff --git a/server/_conversation_segment.py b/server/_conversation_segment.py
index 88f2dbe..0a4b641 100644
--- a/server/_conversation_segment.py
+++ b/server/_conversation_segment.py
@@ -1,3 +1,5 @@
+# Legacy segmented snapshot: active implementation lives in
+# `server/conversation.py`, `server/chat_flow.py`, and `server/conversation_stats.py`.
 @app.route('/api/conversations', methods=['GET'])
 @api_login_required
 @with_terminal
diff --git a/test/test_server_refactor_smoke.py b/test/test_server_refactor_smoke.py
new file mode 100644
index 0000000..95626b1
--- /dev/null
+++ b/test/test_server_refactor_smoke.py
@@ -0,0 +1,56 @@
+from __future__ import annotations
+
+import unittest
+from types import SimpleNamespace
+
+
+class ServerRefactorSmokeTest(unittest.TestCase):
+    def test_chat_flow_imports_and_runner_binding(self):
+        import server.chat_flow as chat_flow
+        import server.chat_flow_runner as runner
+
+        self.assertIs(chat_flow.handle_task_with_sender, runner.handle_task_with_sender)
+        self.assertTrue(callable(chat_flow.start_chat_task))
+        self.assertTrue(callable(chat_flow.run_chat_task_sync))
+
+    def test_chat_flow_helper_functions(self):
+        import server.chat_flow_helpers as helpers
+
+        terminal = SimpleNamespace(
+            deep_thinking_mode=False,
+            thinking_mode=True,
+            api_client=SimpleNamespace(
+                force_thinking_next_call=False,
+                skip_thinking_next_call=False,
+                last_call_used_thinking=False,
+            ),
+            thinking_fast_interval=2,
+        )
+
+        helpers.apply_thinking_schedule(terminal, default_interval=2, debug_logger=lambda _: None)
+        helpers.update_thinking_after_call(terminal, debug_logger=lambda _: None)
+        state = helpers.get_thinking_state(terminal)
+
+        self.assertIsInstance(state, dict)
+        self.assertIn("fast_streak", state)
+        self.assertTrue(helpers.detect_tool_failure({"success": False}))
+        self.assertFalse(helpers.detect_tool_failure({"success": True}))
+
+    def test_runner_helpers_pure_functions(self):
+        import server.chat_flow_runner_helpers as helpers
+
+        self.assertEqual(helpers.extract_intent_from_partial('{"intent": "fix"}'), "fix")
+        self.assertEqual(helpers.resolve_monitor_path({"file_path": "  a.txt  "}), "a.txt")
+        self.assertEqual(helpers.resolve_monitor_memory([1, 2, 3], entry_limit=2), ["1", "2"])
+
+    def test_conversation_stats_exports(self):
+        import server.conversation as conversation
+        import server.conversation_stats as stats
+
+        self.assertTrue(callable(stats.build_admin_dashboard_snapshot))
+        self.assertTrue(callable(conversation.compute_workspace_storage))
+        self.assertTrue(callable(conversation.collect_upload_events))
+
+
+if __name__ == "__main__":
+    unittest.main()