feat(aiot): 告警三表结构升级 + 腾讯云COS对象存储集成

1. 新增三表结构: alarm_event(主表), alarm_event_ext(算法扩展), alarm_llm_analysis(大模型分析)
2. 新增 AlarmEventService 服务，支持 MQTT/HTTP 双路创建告警
3. MQTT handler 双写新旧表，平滑过渡
4. 重写 yudao_aiot_alarm 路由，对接新告警服务
5. 集成腾讯云 COS 对象存储：上传、预签名URL、STS临时凭证
6. 新增 storage 路由：upload/presign/upload-url/sts 四个接口
7. COS 未启用时自动降级本地 uploads/ 目录存储
8. 新增数据迁移脚本 migrate_to_alarm_event.py
9. 删除根目录 main.py（非项目入口）

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

app/main.py

@@ -21,12 +21,13 @@ from app.schemas import (
     DeviceStatisticsResponse,
 )
 from app.services.alert_service import alert_service, get_alert_service
+from app.services.alarm_event_service import alarm_event_service, get_alarm_event_service
 from app.services.ai_analyzer import trigger_async_analysis
 from app.services.mqtt_service import get_mqtt_service
 from app.services.notification_service import get_notification_service
 from app.services.device_service import get_device_service
 from app.utils.logger import logger
-from app.routers import yudao_alert_router, yudao_auth_router, yudao_aiot_alarm_router, yudao_aiot_edge_router
+from app.routers import yudao_alert_router, yudao_auth_router, yudao_aiot_alarm_router, yudao_aiot_edge_router, yudao_aiot_storage_router
 from app.yudao_compat import yudao_exception_handler
 import json
 
@@ -38,13 +39,23 @@ device_service = get_device_service()
 
 
 def handle_mqtt_alert(payload: dict):
-    """处理 MQTT 告警消息"""
+    """处理 MQTT 告警消息（双写：旧表 + 新表）"""
     try:
+        # 1. 写旧表（保持兼容）
         alert = alert_service.create_alert_from_mqtt(payload)
         if alert:
-            # 通过 WebSocket 推送新告警
+            logger.info(f"MQTT 告警写入旧表: {alert.alert_no}")
+
+        # 2. 写新表
+        alarm = alarm_event_service.create_from_mqtt(payload)
+
+        # 3. WebSocket 通知（优先使用新表数据）
+        if alarm:
+            notification_service.notify_sync("new_alert", alarm.to_dict())
+            logger.info(f"MQTT 告警已处理并推送: {alarm.alarm_id}")
+        elif alert:
             notification_service.notify_sync("new_alert", alert.to_dict())
-            logger.info(f"MQTT 告警已处理并推送: {alert.alert_no}")
+            logger.info(f"MQTT 告警已处理并推送(旧表): {alert.alert_no}")
     except Exception as e:
         logger.error(f"处理 MQTT 告警失败: {e}")
 
@@ -100,6 +111,7 @@ app.add_middleware(
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
+
 )
 
 # ==================== 芋道兼容路由 ====================
@@ -111,6 +123,7 @@ app.include_router(yudao_alert_router)
 # aiot 命名空间下的新路由，与旧路由并存
 app.include_router(yudao_aiot_alarm_router)
 app.include_router(yudao_aiot_edge_router)
+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)