修复：P0+P1 生产稳定性和性能优化（6项）

P0 稳定性修复：
- 告警去重字典添加惰性清理机制，防止长时间运行内存溢出
- Redis 连接断开时显式 close() 后再置 None，防止文件描述符泄漏
- 截图消息 ACK 移至成功路径，失败消息留在 pending list 自动重试

P1 性能优化：
- GPU NMS 添加 torch.no_grad() + 显式释放临时张量，减少显存碎片
- 截图存储改为 Redis 原始 bytes，去掉 Base64 编解码开销（兼容旧格式）
- ROI 配置查询 N+1 改为 get_all_bindings() 单次 JOIN 查询

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

core/config_sync.py

@@ -215,6 +215,15 @@ class ConfigSyncManager:
             logger.error(f"本地 Redis 连接失败: {e}")
             self._local_redis = None
 
+    def _safe_close_cloud_redis(self):
+        """安全关闭云端 Redis 连接"""
+        if self._cloud_redis is not None:
+            try:
+                self._cloud_redis.close()
+            except Exception:
+                pass
+            self._cloud_redis = None
+
     def _init_cloud_redis(self):
         """初始化云端 Redis 连接"""
         try:
@@ -238,7 +247,7 @@ class ConfigSyncManager:
 
         except Exception as e:
             logger.warning(f"云端 Redis 连接失败（将使用本地缓存运行）: {e}")
-            self._cloud_redis = None
+            self._safe_close_cloud_redis()
 
     def _init_database(self):
         """初始化 SQLite 数据库连接"""
@@ -311,9 +320,7 @@ class ConfigSyncManager:
         try:
             cameras = self._db_manager.get_all_camera_configs()
             rois = self._db_manager.get_all_roi_configs()
-            binds = []
-            for roi in rois:
-                binds.extend(self._db_manager.get_bindings_by_roi(roi["roi_id"]))
+            binds = self._db_manager.get_all_bindings()
             logger.info(f"[EDGE] Loading config from local db ({source})...")
             logger.info(f"[EDGE] Camera count = {len(cameras)}")
             logger.info(f"[EDGE] ROI count = {len(rois)}")
@@ -378,7 +385,7 @@ class ConfigSyncManager:
                 if self._stop_event.is_set():
                     return
                 logger.warning(f"云端 Redis 连接断开: {e}, {backoff}s 后重连...")
-                self._cloud_redis = None
+                self._safe_close_cloud_redis()
                 self._stop_event.wait(backoff)
                 backoff = min(backoff * 2, max_backoff)
 
@@ -776,10 +783,7 @@ class ConfigSyncManager:
                 bindings_list = self._db_manager.get_bindings_by_camera(camera_id)
             else:
                 roi_configs = self._db_manager.get_all_roi_configs()
-                bindings_list = []
-                for roi in roi_configs:
-                    bindings = self._db_manager.get_bindings_by_roi(roi['roi_id'])
-                    bindings_list.extend(bindings)
+                bindings_list = self._db_manager.get_all_bindings()
 
             roi_dict = {r['roi_id']: r for r in roi_configs}
             bindings_dict: Dict[str, list] = {}
@@ -857,8 +861,7 @@ class ConfigSyncManager:
 
         binds: List[Dict[str, Any]] = []
         rois = self._db_manager.get_all_roi_configs()
-        for roi in rois:
-            binds.extend(self._db_manager.get_bindings_by_roi(roi["roi_id"]))
+        binds = self._db_manager.get_all_bindings()
         return binds
 
     def get_algo_bind_from_redis(self, bind_id: str) -> Optional[Dict[str, Any]]: