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/btpanel/Monitor.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace app\admin\controller\btpanel;
+
+use app\common\controller\Backend;
+use addons\btpanel\library\Api;
+
+/**
+ *
+ */
+class Monitor extends Backend
+{
+    protected $noNeedRight = ['index'];
+
+    public function _initialize()
+    {
+        parent::_initialize();
+        $config = get_addon_config('btpanel');
+        if(!$config['key']){
+            $this->error('未设置BT面板接口密钥，请先设置插件');
+        }
+    }
+
+    /**
+     * 首页
+     */
+    public function index()
+    {
+        $api = new Api();
+        $m_SetControl = $api->setControl();
+        $this->assignconfig('SetControl', $m_SetControl);
+        return $this->view->fetch();
+    }
+}