perf: increase conversation search batch size

- Increase initial search batch from 100 to 5000
- Increase load more batch from 50 to 200
- Raise backend API limit from 100 to 10000
- Improve search performance for large conversation lists

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

server/conversation.py

@@ -95,7 +95,7 @@ def get_conversations(terminal: WebTerminal, workspace: UserWorkspace, username:
         offset = request.args.get('offset', 0, type=int)
         
         # 限制参数范围
-        limit = max(1, min(limit, 100))  # 限制在1-100之间
+        limit = max(1, min(limit, 10000))  # 限制在1-10000之间
         offset = max(0, offset)
         
         result = terminal.get_conversations_list(limit=limit, offset=offset)

static/src/app/methods/search.ts

@@ -1,6 +1,6 @@
 // @ts-nocheck
-const SEARCH_INITIAL_BATCH = 100;
-const SEARCH_MORE_BATCH = 50;
+const SEARCH_INITIAL_BATCH = 5000;
+const SEARCH_MORE_BATCH = 200;
 const SEARCH_PREVIEW_LIMIT = 20;
 
 export const searchMethods = {