重构：建立术语注册中心 constants.py（阶段一）

新建 app/constants.py 作为全局术语单一真相源，包含：
- AlarmType/AlarmStatus/HandleStatus/OrderStatus/CleaningType 枚举
- 所有中文映射字典（ALARM_TYPE_NAMES 等）
- 芋道前端兼容状态映射
- 告警等级、优先级、保洁类型等常量
- ORDER_OPEN_STATUSES 未完成状态集合

已替换 daily_report_service.py 和 order_query.py 中的重复定义。
其余文件（wechat_service/vlm_service/yudao_*等）待下一阶段替换。

app/services/agent/tools/order_query.py

@@ -11,28 +11,10 @@ from langchain_core.runnables import RunnableConfig
 
 from app.utils.logger import logger
 from app.utils.timezone import beijing_now
-
-
-# 告警类型中文映射
-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",
-}
-
-# 工单状态映射
-ORDER_STATUS_NAMES = {
-    "PENDING": "待处理", "ASSIGNED": "已派单", "ARRIVED": "已到岗",
-    "PAUSED": "已暂停", "COMPLETED": "已完成", "CANCELLED": "已取消",
-}
-
-# 工单优先级映射
-PRIORITY_NAMES = {0: "低", 1: "中", 2: "高"}
-
-# 保洁类型映射
-CLEANING_TYPE_NAMES = {
-    "ROUTINE": "日常保洁", "DEEP": "深度保洁",
-    "SPOT": "点状保洁", "EMERGENCY": "应急保洁",
-}
+from app.constants import (
+    ALARM_TYPE_NAMES, ORDER_STATUS_NAMES, PRIORITY_NAMES,
+    CLEANING_TYPE_NAMES, ORDER_OPEN_STATUSES,
+)
 
 
 def _parse_time_range(time_range: str):
@@ -237,8 +219,7 @@ def list_orders(
         user_id = config.get("configurable", {}).get("user_id", "")
 
     # 查待处理工单时不限时间范围（待处理可能是之前创建的）
-    pending_statuses = {"PENDING", "ASSIGNED", "ARRIVED", "PAUSED"}
-    skip_time = status and status in pending_statuses
+    skip_time = status and status in ORDER_OPEN_STATUSES
 
     orders, total, sec_ext_map, clean_ext_map = _query_orders(
         order_type=order_type if order_type != "ALL" else None,