fix: 修复前台4项问题(MCP列举/微信技能上限/Word资产栏/技能MCP反馈) + 同步容器live状态

- #549 平台MCP列举: 注入全量已启用MCP清单, AI不再凭空编造
- #550 微信Bot技能自动发现上限 15->300
- #551 知识库Word文档同步资产后Word栏可见 + 双向删除同步(assets/knowledge级联软删)
- #552 对话反馈实际使用的技能/MCP(used_mcp字段), 含历史消息序列化
- 同步容器内其他未提交live改动(im_bot_platform/TokenDashboard/WechatBot/ChatPage)

backend/python/app/api/im_bot_platform.py

@@ -188,7 +188,7 @@ def _qihua_reply(text: str, user_id: str = None, platform: str = "im") -> str:
     try:
         from app.api.im_llm import _call_real_llm
         db = SessionLocal()
-        return _call_real_llm(db, None, prompt, platform)
+        return _call_real_llm(db, None, prompt, platform, user_id=user_id)
     except Exception as e:
         return f"（AI 回复生成失败：{e}）"
     finally: