feat(aiot): 本地截图回退访问 + 告警API前端兼容

- 挂载 Edge 截图目录为 /captures 静态文件（COS 不可用时回退）
- 挂载 /uploads 静态文件目录
- _alarm_to_camel 支持 local: 前缀转 /captures/ URL
- 告警分页/详情/处理/删除接口兼容前端旧字段名（id、cameraId、status 等）
- 设备告警汇总添加前端兼容别名（cameraId、pendingCount 等）

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

app/main.py

@@ -3,6 +3,7 @@ from contextlib import asynccontextmanager
 from fastapi import FastAPI, UploadFile, File, Form, HTTPException, Depends, Query, WebSocket, WebSocketDisconnect
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import FileResponse
+from fastapi.staticfiles import StaticFiles
 from typing import Optional
 from datetime import datetime
 from pathlib import Path
@@ -85,6 +86,16 @@ app.include_router(yudao_aiot_storage_router)
 # 注册芋道格式异常处理器
 app.add_exception_handler(HTTPException, yudao_exception_handler)
 
+# ==================== 静态文件（本地截图） ====================
+_uploads_dir = Path("uploads")
+_uploads_dir.mkdir(parents=True, exist_ok=True)
+app.mount("/uploads", StaticFiles(directory=str(_uploads_dir)), name="uploads")
+
+# Edge 本地截图目录（COS 未配置时的回退访问路径）
+_edge_captures_dir = Path(r"C:\Users\16337\PycharmProjects\ai_edge\data\captures")
+if _edge_captures_dir.exists():
+    app.mount("/captures", StaticFiles(directory=str(_edge_captures_dir)), name="captures")
+
 
 def get_alert_svc():
     return alert_service