feat(scheduler): 新增死锁检测器，改进任务取消机制，优化异步通知

src/common/database/optimization/batch_scheduler.py

@@ -188,18 +188,24 @@ class AdaptiveBatchScheduler:
         future = asyncio.get_event_loop().create_future()
         operation.future = future
 
+        should_execute_immediately = False
+        total_queued = 0
+
         async with self._lock:
             # 检查队列是否已满
             total_queued = sum(len(q) for q in self.operation_queues.values())
             if total_queued >= self.max_queue_size:
-                # 队列满，直接执行（阻塞模式）
-                logger.warning(f"队列已满({total_queued})，直接执行操作")
-                await self._execute_operations([operation])
+                should_execute_immediately = True
             else:
                 # 添加到优先级队列
                 self.operation_queues[operation.priority].append(operation)
                 self.stats.total_operations += 1
 
+        # 🔧 修复：在锁外执行操作，避免死锁
+        if should_execute_immediately:
+            logger.warning(f"队列已满({total_queued})，直接执行操作")
+            await self._execute_operations([operation])
+
         return future
 
     async def _scheduler_loop(self) -> None: