fix: 手续费同步改为后台执行，避免阻塞 Web 请求

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

app.py

@@ -1560,7 +1560,12 @@ def api_contract_profile():
 @require_nav("fees")
 def fees():
     from trading_context import get_trading_mode
-    from ctp_fee_worker import try_daily_ctp_fee_sync, get_fee_last_sync, fees_synced_today
+    from ctp_fee_worker import (
+        schedule_ctp_fee_sync,
+        get_fee_last_sync,
+        fees_synced_today,
+        fee_sync_in_progress,
+    )
     from vnpy_bridge import ctp_status
 
     mode = get_trading_mode(get_setting)
@@ -1568,7 +1573,7 @@ def fees():
         action = request.form.get("action")
         if action == "sync_ctp":
             force = request.form.get("force") == "1"
-            count, msg = try_daily_ctp_fee_sync(
+            _, msg = schedule_ctp_fee_sync(
                 mode,
                 get_setting=get_setting,
                 set_setting=set_setting,
@@ -1586,6 +1591,7 @@ def fees():
         fee_counts=fee_counts,
         fee_last_sync=get_fee_last_sync(get_setting),
         fee_synced_today=fees_synced_today(get_setting),
+        fee_sync_running=fee_sync_in_progress(),
         ctp_connected=bool(ctp_st.get("connected")),
     )