feat: sync account priorities after rate changes

backend/app/services/scheduler.py

@@ -160,6 +160,7 @@ def _check_upstream(upstream_id: int) -> None:
     if changes:
         _notify_rate_changed(upstream_id, upstream.name, upstream.base_url, changes)
         _sync_website_bindings(upstream_id, changes)
+        _sync_account_priorities(upstream_id)
 
     if balance_alert_triggered:
         _notify_balance_low(
@@ -284,6 +285,17 @@ def _sync_upstream_keys(upstream_id: int, snapshot: dict[str, Any], captured_at:
         db.close()
 
 
+def _sync_account_priorities(upstream_id: int) -> None:
+    """倍率变更后自动更新已导入下游账号的 priority。"""
+    db = SessionLocal()
+    try:
+        website_sync.sync_account_priorities_for_upstream(db, upstream_id)
+    except Exception:
+        logger.exception("account priority sync failed for upstream %s", upstream_id)
+    finally:
+        db.close()
+
+
 def _sync_website_bindings(upstream_id: int, changes: list[dict[str, Any]]) -> None:
     db = SessionLocal()
     try: