完善delivery端状态bug

mall_sql/migrations/20260515_delivery_staff_v2_minimal.sql

@@ -79,6 +79,7 @@ ALTER TABLE public.ml_delivery_staff ENABLE ROW LEVEL SECURITY;
 ALTER TABLE public.ml_delivery_stations ENABLE ROW LEVEL SECURITY;
 
 DROP POLICY IF EXISTS delivery_staff_self_select ON public.ml_delivery_staff;
+DROP POLICY IF EXISTS delivery_staff_assignable_select ON public.ml_delivery_staff;
 DROP POLICY IF EXISTS delivery_staff_self_update ON public.ml_delivery_staff;
 CREATE POLICY delivery_staff_self_select
   ON public.ml_delivery_staff
@@ -94,6 +95,18 @@ CREATE POLICY delivery_staff_self_select
     )
   );
 
+CREATE POLICY delivery_staff_assignable_select
+  ON public.ml_delivery_staff
+  FOR SELECT
+  TO authenticated
+  USING (
+    deleted_at IS NULL
+    AND status = 1
+    AND COALESCE(is_active, true) = true
+    AND online_status = 'online'
+    AND uid IS NOT NULL
+  );
+
 CREATE POLICY delivery_staff_self_update
   ON public.ml_delivery_staff
   FOR UPDATE