fix: response_code持久化到数据库 + 工单客户端加tenant-id

1. wechat_service: save/get_response_code 改为内存+数据库双写，
   容器重启后边缘resolve仍能更新企微卡片
2. work_order_client: 请求头加 tenant-id，签名公式加 query_str 参数
3. config: WorkOrderConfig 新增 tenant_id 字段

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

app/services/wechat_service.py

@@ -83,12 +83,51 @@ class WeChatService:
         return self._access_token
 
     def save_response_code(self, task_id: str, response_code: str):
-        """保存卡片的 response_code（用于后续更新卡片状态）"""
+        """保存卡片的 response_code（内存缓存 + 数据库持久化）"""
         self._response_codes[task_id] = response_code
+        try:
+            from app.models import get_session, AlarmEventExt
+            db = get_session()
+            try:
+                ext = db.query(AlarmEventExt).filter(
+                    AlarmEventExt.alarm_id == task_id,
+                    AlarmEventExt.ext_type == "WECHAT_RESPONSE_CODE",
+                ).first()
+                if ext:
+                    ext.ext_data = {"response_code": response_code}
+                else:
+                    ext = AlarmEventExt(
+                        alarm_id=task_id,
+                        ext_type="WECHAT_RESPONSE_CODE",
+                        ext_data={"response_code": response_code},
+                    )
+                    db.add(ext)
+                db.commit()
+            finally:
+                db.close()
+        except Exception as e:
+            logger.warning(f"持久化 response_code 失败: {e}")
 
     def get_response_code(self, task_id: str) -> Optional[str]:
-        """获取并消耗 response_code（只能用一次）"""
-        return self._response_codes.pop(task_id, None)
+        """获取 response_code（优先内存缓存，回退数据库查询）"""
+        code = self._response_codes.pop(task_id, None)
+        if code:
+            return code
+        try:
+            from app.models import get_session, AlarmEventExt
+            db = get_session()
+            try:
+                ext = db.query(AlarmEventExt).filter(
+                    AlarmEventExt.alarm_id == task_id,
+                    AlarmEventExt.ext_type == "WECHAT_RESPONSE_CODE",
+                ).first()
+                if ext and ext.ext_data:
+                    return ext.ext_data.get("response_code", "")
+            finally:
+                db.close()
+        except Exception as e:
+            logger.warning(f"查询 response_code 失败: {e}")
+        return None
 
     # ==================== 媒体上传 ====================