feat(aiot): 告警冷却时间调整 + 截图本地保留 + 中文路径修复

- 离岗检测冷却时间: 300s → 600s（10分钟）
- 入侵检测冷却时间: 120s → 300s（5分钟）
- 入侵告警级别改为高（alarm_level=3）
- COS 不可用时保留本地截图文件，不再上报后删除
- 修复 cv2.imwrite 中文路径失败，改用 imencode + write_bytes
- 配置订阅在 LOCAL 模式下跳过 Redis 连接

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/storage_manager.py

@@ -44,9 +44,14 @@ class PendingCapture:
 
 class ImageStorageManager:
     """图片存储管理器"""
-    
+
     _instance = None
     _lock = threading.Lock()
+
+    @staticmethod
+    def _sanitize_filename(name: str) -> str:
+        """清理文件名中的非法字符（/ \\ 等路径分隔符替换为下划线）"""
+        return name.replace("/", "_").replace("\\", "_")
     
     def __new__(cls, config: Optional[CaptureConfig] = None):
         if cls._instance is None:
@@ -103,17 +108,14 @@ class ImageStorageManager:
                 logger.error(f"图片保存异常: {e}")
     
     def _save_image(self, capture: PendingCapture) -> Optional[str]:
-        """保存单张图片"""
+        """保存单张图片（使用 imencode+write_bytes 避免中文路径问题）"""
         try:
             image = capture.image
-            
+
             if image is None:
                 self._failed_count += 1
                 return None
-            
-            if len(image.shape) == 3 and image.shape[2] == 3:
-                image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
-            
+
             if image.shape[1] > self.config.max_width or image.shape[0] > self.config.max_height:
                 scale = min(
                     self.config.max_width / image.shape[1],
@@ -124,28 +126,33 @@ class ImageStorageManager:
                     int(image.shape[0] * scale)
                 )
                 image = cv2.resize(image, new_size, interpolation=cv2.INTER_AREA)
-            
+
             date_dir = capture.timestamp.strftime("%Y%m%d")
             save_dir = Path(self.config.image_dir) / date_dir
             save_dir.mkdir(parents=True, exist_ok=True)
-            
-            filename = f"{capture.camera_id}_{capture.alert_id}{self.config.save_format}"
+
+            safe_camera_id = self._sanitize_filename(capture.camera_id)
+            filename = f"{safe_camera_id}_{capture.alert_id}{self.config.save_format}"
             filepath = save_dir / filename
-            
-            success = cv2.imwrite(
-                str(filepath),
+
+            # 使用 imencode + write_bytes 代替 imwrite，
+            # 因为 cv2.imwrite 在 Windows 上无法处理中文路径
+            success, buffer = cv2.imencode(
+                self.config.save_format,
                 image,
                 [cv2.IMWRITE_JPEG_QUALITY, self.config.quality]
             )
-            
+
             if success:
+                filepath.write_bytes(buffer.tobytes())
                 self._saved_count += 1
-                logger.debug(f"图片已保存: {filepath}")
+                logger.info(f"图片已保存: {filepath}")
                 return str(filepath)
             else:
+                logger.warning(f"图片编码失败: {filepath}")
                 self._failed_count += 1
                 return None
-                
+
         except Exception as e:
             logger.error(f"保存图片失败: {e}")
             self._failed_count += 1
@@ -158,20 +165,28 @@ class ImageStorageManager:
         alert_id: str,
         timestamp: Optional[datetime] = None
     ) -> Optional[str]:
-        """异步保存抓拍图片"""
+        """异步保存抓拍图片，返回预计的文件路径"""
+        ts = timestamp or datetime.now()
         capture = PendingCapture(
             image=image,
             camera_id=camera_id,
             alert_id=alert_id,
-            timestamp=timestamp or datetime.now()
+            timestamp=ts,
         )
         self._save_queue.put(capture)
-        return f"<queued: {alert_id}>"
+
+        # 返回确定性的文件路径（与 _save_image 使用相同的命名规则）
+        date_dir = ts.strftime("%Y%m%d")
+        safe_camera_id = self._sanitize_filename(camera_id)
+        filename = f"{safe_camera_id}_{alert_id}{self.config.save_format}"
+        filepath = Path(self.config.image_dir) / date_dir / filename
+        return str(filepath)
     
     def get_image_path(self, camera_id: str, alert_id: str) -> Optional[str]:
         """获取已保存图片路径"""
         date_str = datetime.now().strftime("%Y%m%d")
-        filename = f"{camera_id}_{alert_id}{self.config.save_format}"
+        safe_camera_id = self._sanitize_filename(camera_id)
+        filename = f"{safe_camera_id}_{alert_id}{self.config.save_format}"
         filepath = Path(self.config.image_dir) / date_str / filename
         
         if filepath.exists():