fix: 修复语法错误和导入问题

main.py

@@ -467,11 +467,6 @@ async def handle_matrix_message(action: str, conversation_id: str = None, user_m
         finally:
             db.close()
 
-    except Exception as e:
-        logger.error(f"处理Matrix消息失败: {e}")
-    finally:
-        db.close()
-
 
 # ==================== 启动和关闭 ====================
 

services/matrix_service.py

@@ -202,3 +202,7 @@ class MatrixBot:
             except:
                 pass
             self.is_running = False
+
+
+# 全局实例
+matrix_bot = MatrixBot()