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

thinkphp/library/think/process/exception/Failed.php

@@ -0,0 +1,42 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2015 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: yunwuxin <448901948@qq.com>
+// +----------------------------------------------------------------------
+
+namespace think\process\exception;
+
+use think\Process;
+
+class Failed extends \RuntimeException
+{
+
+    private $process;
+
+    public function __construct(Process $process)
+    {
+        if ($process->isSuccessful()) {
+            throw new \InvalidArgumentException('Expected a failed process, but the given process was successful.');
+        }
+
+        $error = sprintf('The command "%s" failed.' . "\nExit Code: %s(%s)", $process->getCommandLine(), $process->getExitCode(), $process->getExitCodeText());
+
+        if (!$process->isOutputDisabled()) {
+            $error .= sprintf("\n\nOutput:\n================\n%s\n\nError Output:\n================\n%s", $process->getOutput(), $process->getErrorOutput());
+        }
+
+        parent::__construct($error);
+
+        $this->process = $process;
+    }
+
+    public function getProcess()
+    {
+        return $this->process;
+    }
+}