修复：Agent查询待处理工单始终为空

根因：list_orders 和 query_order_stats 默认按 create_time 过滤
今日范围，但待处理工单可能是昨天或更早创建的，导致全部漏掉。

修复内容：
1. 查询待处理状态工单时跳过时间范围过滤（skip_time_filter）
2. query_order_stats 额外返回 current_pending/current_assigned
   表示当前所有未完成工单数（不限时间）
3. _query_orders 新增 tenant_id 过滤（从配置读取）
4. 系统提示词增加查询技巧引导 Agent 正确使用 status 参数

app/services/agent/tools/order_query.py

@@ -81,20 +81,29 @@ def _query_orders(
     end_time=None,
     limit: int = 100,
     assignee_name: Optional[str] = None,
+    skip_time_filter: bool = False,
 ):
     """查询 IoT 工单（跨库只读）"""
     from app.models_iot import get_iot_session, IotOpsOrder
+    from app.config import settings
     db = get_iot_session()
     try:
         q = db.query(IotOpsOrder).filter(IotOpsOrder.deleted == 0)
+        # 租户隔离
+        try:
+            tid = int(settings.work_order.tenant_id)
+            q = q.filter(IotOpsOrder.tenant_id == tid)
+        except Exception:
+            pass
         if order_type and order_type != "ALL":
             q = q.filter(IotOpsOrder.order_type == order_type)
         if status:
             q = q.filter(IotOpsOrder.status == status)
-        if start_time:
-            q = q.filter(IotOpsOrder.create_time >= start_time)
-        if end_time:
-            q = q.filter(IotOpsOrder.create_time < end_time)
+        if not skip_time_filter:
+            if start_time:
+                q = q.filter(IotOpsOrder.create_time >= start_time)
+            if end_time:
+                q = q.filter(IotOpsOrder.create_time < end_time)
         if assignee_name:
             q = q.filter(IotOpsOrder.assignee_name.contains(assignee_name))
 
@@ -151,6 +160,16 @@ def query_order_stats(time_range: str = "today", order_type: str = "ALL") -> str
         start_time=start, end_time=end, limit=10000,
     )
 
+    # 额外统计当前所有未完成工单（不限时间范围）
+    pending_orders, pending_total, _, _ = _query_orders(
+        order_type=order_type if order_type != "ALL" else None,
+        status="PENDING", limit=10000, skip_time_filter=True,
+    )
+    assigned_orders, assigned_total, _, _ = _query_orders(
+        order_type=order_type if order_type != "ALL" else None,
+        status="ASSIGNED", limit=10000, skip_time_filter=True,
+    )
+
     # 按状态统计
     status_count = {}
     for o in orders:
@@ -180,6 +199,8 @@ def query_order_stats(time_range: str = "today", order_type: str = "ALL") -> str
         "by_order_type": {k: v for k, v in type_count.items() if v > 0},
         "by_alarm_type": {ALARM_TYPE_NAMES.get(t, t): c for t, c in alarm_type_count.items()} if alarm_type_count else {},
         "false_alarm_count": false_alarm_count,
+        "current_pending": pending_total,
+        "current_assigned": assigned_total,
     }
     return json.dumps(result, ensure_ascii=False)
 
@@ -215,10 +236,15 @@ def list_orders(
     if config and assigned_to_me:
         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
+
     orders, total, sec_ext_map, clean_ext_map = _query_orders(
         order_type=order_type if order_type != "ALL" else None,
         status=status or None,
         start_time=start, end_time=end, limit=limit,
+        skip_time_filter=skip_time,
     )
 
     items = []