重构(wechat_service): ALARM_TYPE_NAMES/LEVEL_NAMES 改用 constants 统一定义

app/services/wechat_service.py

@@ -13,19 +13,9 @@ import httpx
 import time
 from typing import Optional, List, Dict
 
+from app.constants import ALARM_TYPE_NAMES, ALARM_LEVEL_NAMES
 from app.utils.logger import logger
 
-# 告警类型中文映射（全局复用）
-ALARM_TYPE_NAMES = {
-    "leave_post": "人员离岗",
-    "intrusion": "周界入侵",
-    "illegal_parking": "车辆违停",
-    "vehicle_congestion": "车辆拥堵",
-}
-
-# 告警级别映射
-ALARM_LEVEL_NAMES = {0: "紧急", 1: "重要", 2: "普通", 3: "轻微"}
-
 
 class WeChatService:
     """企微通知服务（单例）"""