feat(HEL-164): 显示管理员刷新实际结果

Co-authored-by: multica-agent <github@multica.ai>

backend/features/system/http.py

@@ -26,13 +26,15 @@ class SystemHttpMixin:
     def start_background_refresh(self) -> None:
         try:
             body = self.read_json_body(allow_empty=True)
-            started = self.application_service.request_background_sync(
+            refresh = self.application_service.request_background_sync(
                 str(body.get("trade_date") or date.today().isoformat())
             )
+            started = bool(refresh.get("started"))
             self.send_json(
                 {
                     "ok": True,
                     "started": started,
+                    "job_key": str(refresh.get("job_key") or ""),
                     "message": "后台刷新已开始" if started else "已有后台刷新任务正在运行",
                 },
                 HTTPStatus.ACCEPTED,

backend/jobs/service.py

@@ -20,15 +20,16 @@ class JobServiceMixin:
         workers_stopped = self.jobs.wait_for_idle(timeout_seconds)
         return scheduler_stopped and workers_stopped
 
-    def request_background_sync(self, trade_date: str) -> bool:
+    def request_background_sync(self, trade_date: str) -> dict[str, object]:
         normalized = normalize_date(trade_date)
         key = f"manual:{normalized}:{time.time_ns()}"
-        return self.jobs.submit(
+        started = self.jobs.submit(
             "market.refresh",
             key,
             lambda: self.sync_dashboard(normalized),
             {"trade_date": normalized, "trigger": "administrator"},
         )
+        return {"started": started, "job_key": key if started else ""}
 
     def _background_refresh_tick(self) -> None:
         if not (