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/Customform.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace app\admin\controller\example;
+
+use app\admin\model\AdminLog;
+use app\common\controller\Backend;
+
+/**
+ * 自定义表单示例
+ *
+ * @icon   fa fa-table
+ * @remark FastAdmin支持在控制器间跳转,点击后将切换到另外一个TAB中,无需刷新当前页面
+ */
+class Customform extends Backend
+{
+    protected $model = null;
+
+    public function _initialize()
+    {
+        parent::_initialize();
+        $this->model = model('AdminLog');
+    }
+
+    public function index()
+    {
+        if ($this->request->isPost()) {
+            $this->success("提交成功", null, ['data' => json_encode($this->request->post("row/a"), JSON_UNESCAPED_UNICODE)]);
+        }
+        return $this->view->fetch();
+    }
+
+    public function get_title_list()
+    {
+        $query = $this->request->get("query");
+        $suggestions = AdminLog::where('title', 'like', '%' . $query . '%')->limit(10)->column("title");
+        $result = [
+            'query'       => $query,
+            'suggestions' => $suggestions
+        ];
+        return json($result);
+    }
+}