修复：IoT回调接口422错误，字段改为Optional兼容null值

app/routers/wechat_notify_api.py

@@ -21,11 +21,11 @@ class SendCardRequest(BaseModel):
     orderId: str
     userIds: List[str]
     title: str
-    areaName: str = ""
-    cameraName: str = ""
-    eventTime: str = ""
-    level: int = 2
-    snapshotUrl: str = ""
+    areaName: Optional[str] = ""
+    cameraName: Optional[str] = ""
+    eventTime: Optional[str] = ""
+    level: Optional[int] = 2
+    snapshotUrl: Optional[str] = ""
 
 
 class SyncStatusRequest(BaseModel):
@@ -33,8 +33,8 @@ class SyncStatusRequest(BaseModel):
     alarmId: str
     orderId: str
     status: str  # confirmed / completed / false_alarm / auto_resolved
-    operator: str = ""
-    remark: str = ""
+    operator: Optional[str] = ""
+    remark: Optional[str] = ""
 
 
 @router.post("/send-card")
@@ -53,11 +53,11 @@ async def send_card(req: SendCardRequest):
             user_ids=req.userIds,
             alarm_id=req.alarmId,
             alarm_type=req.title,
-            area_name=req.areaName,
-            camera_name=req.cameraName,
+            area_name=req.areaName or "",
+            camera_name=req.cameraName or "",
             description=f"工单编号：{req.orderId}",
-            event_time=req.eventTime,
-            alarm_level=req.level,
+            event_time=req.eventTime or "",
+            alarm_level=req.level or 2,
         )
 
         if sent:
@@ -98,7 +98,7 @@ async def sync_status(req: SyncStatusRequest):
             alarm_id=req.alarmId,
             alarm_status=mapping["alarm_status"],
             handle_status=mapping["handle_status"],
-            handler=req.operator,
+            handler=req.operator or "",
             remark=req.remark or f"IoT工单同步: {req.status}",
         )
         logger.info(f"告警状态已同步: alarm={req.alarmId}, status={req.status}")