修复：send-card 群聊通知三个问题

1. 告警告警重复：用 alarm_type_code 映射而非 IoT 的 title
2. 摄像头未知：从告警表查 device_id 获取摄像头名称
3. 截图403：从告警表取 object key 生成预签名 URL（IoT 传的永久URL无签名）

app/routers/wechat_notify_api.py

@@ -93,17 +93,51 @@ async def send_card(request: Request):
         # 群聊通知
         group_chat_id = settings.wechat.group_chat_id
         if group_chat_id:
-            # 截图预签名URL
+            # 截图：从告警表获取 object key 生成预签名 URL
             from app.services.notify_dispatch import _get_presigned_url
-            presigned_url = _get_presigned_url(req.snapshotUrl or "")
+            snapshot_url = req.snapshotUrl or ""
+            # 如果是完整 COS URL，从告警表取 object key 重新生成预签名
+            if not snapshot_url or "403" in snapshot_url:
+                snapshot_url = ""
+            presigned_url = ""
+            if snapshot_url:
+                presigned_url = _get_presigned_url(snapshot_url)
+
+            # 从告警表补全摄像头名称和截图（IoT 可能没传或传了无效数据）
+            camera_name = req.cameraName or ""
+            alarm_type_code = ""
+            alarm_snapshot_key = ""
+            from app.models import get_session, AlarmEvent
+            from app.services.camera_name_service import get_camera_name_service
+            db = get_session()
+            try:
+                alarm = db.query(AlarmEvent).filter(AlarmEvent.alarm_id == req.alarmId).first()
+                if alarm:
+                    alarm_type_code = alarm.alarm_type or ""
+                    alarm_snapshot_key = alarm.snapshot_url or ""
+                    if not camera_name or camera_name == "未知":
+                        if alarm.device_id:
+                            camera_service = get_camera_name_service()
+                            camera_info = await camera_service.get_camera_info(alarm.device_id)
+                            camera_name = camera_service.format_display_name(alarm.device_id, camera_info)
+            finally:
+                db.close()
+
+            # 截图预签名：优先用告警表的 object key（能正确签名）
+            if not presigned_url or not snapshot_url:
+                if alarm_snapshot_key:
+                    presigned_url = _get_presigned_url(alarm_snapshot_key)
+
+            # alarm_type: 用 alarm_type_code 避免"告警告警"
+            actual_alarm_type = alarm_type_code or req.title
 
             await wechat.send_group_alarm_combo(
                 chat_id=group_chat_id,
                 alarm_id=req.alarmId,
-                alarm_type=req.title,
+                alarm_type=actual_alarm_type,
                 area_name=req.areaName or "",
-                camera_name=req.cameraName or "",
-                description=f"工单编号：{req.orderId}",
+                camera_name=camera_name,
+                description=req.title,
                 event_time=req.eventTime or "",
                 alarm_level=req.level or 2,
                 snapshot_url=presigned_url,
@@ -111,12 +145,22 @@ async def send_card(request: Request):
             )
 
         # 私发卡片
+        # 从告警表获取 alarm_type_code（避免重复"告警"）
+        if not alarm_type_code:
+            from app.models import get_session, AlarmEvent
+            db = get_session()
+            try:
+                alarm = db.query(AlarmEvent).filter(AlarmEvent.alarm_id == req.alarmId).first()
+                alarm_type_code = alarm.alarm_type if alarm else ""
+            finally:
+                db.close()
+
         sent = await wechat.send_alarm_card(
             user_ids=req.userIds,
             alarm_id=req.alarmId,
-            alarm_type=req.title,
+            alarm_type=alarm_type_code or req.title,
             area_name=req.areaName or "",
-            camera_name=req.cameraName or "",
+            camera_name=camera_name if 'camera_name' in dir() else (req.cameraName or ""),
             description=f"工单编号：{req.orderId}",
             event_time=req.eventTime or "",
             alarm_level=req.level or 2,