feat(duty): add users/options endpoint filtered by duty staff role

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/api/duty.py

@@ -61,6 +61,18 @@ def day_detail(
     return success_response(duty_svc.get_day_detail(db, tenant_no, d))
 
 
+@router.get("/users/options")
+def duty_user_options(
+    _user: dict = Depends(require_admin_or_super_admin),
+    db: Session = Depends(get_db),
+):
+    """值班可安排人员：仅「值班人员」角色下的启用用户。"""
+    tenant_no = _user.get("tenant_no", "") or ""
+    rows = duty_svc.list_duty_staff_users(db, tenant_no)
+    out = [{"label": r["label"], "value": r["id"]} for r in rows]
+    return success_response(out)
+
+
 @router.post("/day")
 def save_day(
     body: DutyDaySaveBody,