feat: 更新首页信息处理模型，支持内存缓存与过期机制；添加全量目录同步脚本

backend/app/main.py

@@ -138,6 +138,7 @@ def create_app(settings=None, wq_client=None, ai_model_factory=None):
     app.state.settings = settings
     app.state.ai = ai_runtime
     app.state.home_information_locks = {}
+    app.state.home_message_cache = {}
     app.state.research = research_runtime
     app.state.mcp = mcp_runtime
     login_failures = defaultdict(list)