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

public/GoJS-master/assets/js/api.js

@@ -0,0 +1,9 @@
+/* Copyright (C) 1998-2020 by Northwoods Software Corporation. All Rights Reserved. */
+var hash = null;
+function changeHash() {
+  if (hash !== null) $("[name='" + hash + "']").parent().css('background', '');
+  hash = window.location.hash.slice(1);
+  $("[name='" + hash + "']").parent().css('background-color', 'rgba(230, 242, 255, .4)'); // light blue
+}
+$(document).ready(changeHash);
+$(window).on('hashchange', changeHash);