feat: 后端全量更新 - 含所有本次需求

- Contract.php: 返回合约账户余额(balance_contract)
- My.php: 地址管理增加BTC/ETH
- AppContract.php: 一键平仓(closeall)
- AppProxy.php: 代理专属注册链接 + 分级权限(L1/L2)
- site.php: 手续费减半(0.018→0.009)
- agent_permission_setup.sql: 代理权限SQL
- crypto_news_crawler.py: 新闻自动采集脚本

application/admin/controller/kefu/Toolbar.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace app\admin\controller\kefu;
+
+use app\common\controller\Backend;
+
+/**
+ * 窗口工具栏管理
+ *
+ * @icon fa fa-circle-o
+ */
+class Toolbar extends Backend
+{
+
+    /**
+     * KefuToolbar模型对象
+     * @var \app\admin\model\KefuToolbar
+     */
+    protected $model = null;
+
+    public function _initialize()
+    {
+        parent::_initialize();
+        $this->model = new \app\admin\model\KefuToolbar;
+        $this->view->assign("statusList", $this->model->getStatusList());
+        $this->view->assign("PositionList", $this->model->getPositionList());
+    }
+
+}