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

addons/translate/controller/Index.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace addons\translate\controller;
+
+use think\addons\Controller;
+
+class Index extends Controller
+{
+
+    public function index()
+    {
+        $languageList = get_addon_fullconfig('translate');
+        $languageList = $languageList[1]['content'];
+
+        $this->view->assign('postUrl', addon_url('translate/index/translate'));
+        $this->view->assign('languageList', json_encode($languageList));
+        return $this->view->fetch();
+    }
+
+    public function translate()
+    {
+        $source     = $this->request->post("source");
+        $sourceLang = $this->request->post("source_lang");
+        $targetLang = $this->request->post("target_lang");
+        $res = doGoogleTranslate($source, $targetLang, $sourceLang, true);
+        return json_encode($res);
+    }
+
+}