fix:ai哥神秘修复无法模式切换

bot.py

@@ -109,12 +109,33 @@ async def graceful_shutdown():
         # 停止所有异步任务
         await async_task_manager.stop_and_wait_all_tasks()
 
-        tasks = [t for t in asyncio.all_tasks() if t is not asyncio.current_task()]
-        for task in tasks:
-            task.cancel()
-        await asyncio.gather(*tasks, return_exceptions=True)
+        # 获取所有剩余任务，排除当前任务
+        remaining_tasks = [t for t in asyncio.all_tasks() if t is not asyncio.current_task()]
+        
+        if remaining_tasks:
+            logger.info(f"正在取消 {len(remaining_tasks)} 个剩余任务...")
+            
+            # 取消所有剩余任务
+            for task in remaining_tasks:
+                if not task.done():
+                    task.cancel()
+            
+            # 等待所有任务完成，设置超时
+            try:
+                await asyncio.wait_for(
+                    asyncio.gather(*remaining_tasks, return_exceptions=True),
+                    timeout=15.0
+                )
+                logger.info("所有剩余任务已成功取消")
+            except asyncio.TimeoutError:
+                logger.warning("等待任务取消超时，强制继续关闭")
+            except Exception as e:
+                logger.error(f"等待任务取消时发生异常: {e}")
+        
+        logger.info("麦麦优雅关闭完成")
+        
     except Exception as e:
-        logger.error(f"麦麦关闭失败: {e}")
+        logger.error(f"麦麦关闭失败: {e}", exc_info=True)
 
 
 def check_eula():