修复实盘顶栏误显示模拟盘会话资金：无交易所余额时显示 —，切模式清缓存。

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

lib/instance/runtime_config_lib.py

@@ -71,6 +71,13 @@ def apply_env_reload(env_path: str, get_db: Callable, changed_keys: list[str], g
                 set_trading_mode(get_db, raw)
         except Exception:
             pass
+        # 清余额缓存,避免模拟盘资金残留到实盘顶栏
+        try:
+            from app import invalidate_account_balance_cache
+
+            invalidate_account_balance_cache()
+        except Exception:
+            pass
     from lib.env.env_schema import updates_need_restart
 
     return {"restart_required": updates_need_restart(groups, changed_keys)}