功能：area_id 全链路支持 + 截图处理器独立 Redis 连接

- CameraInfo 模型添加 area_id 字段
- SQLite 表增加 area_id 列及迁移
- config_sync 同步 area_id 到本地
- 告警 ext_data 携带 area_id
- 截图处理器使用独立 Redis 连接，避免与配置同步阻塞冲突
- get_all_camera_configs 使用 cursor.description 动态获取列名

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

config/database.py

@@ -233,6 +233,7 @@ class SQLiteManager:
                 location TEXT,
                 roi_group_id TEXT,
                 extra_params TEXT,
+                area_id INTEGER,
                 updated_at TEXT
             )
         """)
@@ -250,7 +251,14 @@ class SQLiteManager:
         """)
         
         self._conn.commit()
-        
+
+        # 迁移：为已有数据库添加 area_id 列
+        try:
+            cursor.execute("ALTER TABLE camera_configs ADD COLUMN area_id INTEGER")
+            self._conn.commit()
+        except Exception:
+            pass  # 列已存在，忽略
+
         self._init_default_algorithms()
     
     def _init_default_algorithms(self):
@@ -555,8 +563,8 @@ class SQLiteManager:
             cursor.execute("""
                 INSERT OR REPLACE INTO camera_configs (
                     camera_id, rtsp_url, camera_name, status, enabled,
-                    location, roi_group_id, extra_params, updated_at
-                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+                    location, roi_group_id, extra_params, area_id, updated_at
+                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             """, (
                 camera_id, rtsp_url,
                 kwargs.get('camera_name'),
@@ -565,6 +573,7 @@ class SQLiteManager:
                 kwargs.get('location'),
                 kwargs.get('roi_group_id'),
                 str(kwargs.get('extra_params')) if kwargs.get('extra_params') else None,
+                kwargs.get('area_id'),
                 now
             ))
             self._conn.commit()
@@ -580,8 +589,7 @@ class SQLiteManager:
             cursor.execute("SELECT * FROM camera_configs WHERE camera_id = ?", (camera_id,))
             row = cursor.fetchone()
             if row:
-                columns = ['camera_id', 'rtsp_url', 'camera_name', 'status', 
-                          'enabled', 'location', 'roi_group_id', 'extra_params', 'updated_at']
+                columns = [desc[0] for desc in cursor.description]
                 return dict(zip(columns, row))
             return None
         except Exception as e:
@@ -593,8 +601,7 @@ class SQLiteManager:
         try:
             cursor = self._conn.cursor()
             cursor.execute("SELECT * FROM camera_configs ORDER BY camera_id")
-            columns = ['camera_id', 'rtsp_url', 'camera_name', 'status', 
-                      'enabled', 'location', 'roi_group_id', 'extra_params', 'updated_at']
+            columns = [desc[0] for desc in cursor.description]
             return [dict(zip(columns, row)) for row in cursor.fetchall()]
         except Exception as e:
             logger.error(f"获取所有摄像头配置失败: {e}")