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/example/Echarts.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace app\admin\controller\example;
+
+use app\common\controller\Backend;
+
+/**
+ * 统计图表示例
+ *
+ * @icon   fa fa-charts
+ * @remark 展示在FastAdmin中使用Echarts展示丰富多彩的统计图表
+ */
+class Echarts extends Backend
+{
+    protected $model = null;
+
+    public function _initialize()
+    {
+        parent::_initialize();
+        $this->model = model('AdminLog');
+    }
+
+    /**
+     * 查看
+     */
+    public function index()
+    {
+
+        return $this->view->fetch();
+    }
+
+    /**
+     * 详情
+     */
+    public function detail($ids)
+    {
+        $row = $this->model->get(['id' => $ids]);
+        if (!$row) {
+            $this->error(__('No Results were found'));
+        }
+        $this->view->assign("row", $row->toArray());
+        return $this->view->fetch();
+    }
+}