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/api/lang/en-us/strategy.php

@@ -0,0 +1,22 @@
+<?php
+return [
+    "请输入要搜索的币种" => "Please Enter Token Name",
+    "币种不存在" => "Invalid Token",
+    "请选择要设置的币种" => "Please Select a Token",
+    "请先完成实名认证" => "Please Complete KYC Verification",
+    "币种已下架或不存在" => "Invalid Token",
+    "最低买单数量为" => "Min Buy Amount as",
+    "最高做单数量" => "Max Long Amount",
+    "信誉值不足，请充值" => "Fee Low，Please Reload",
+    "提交成功" => "Succeed",
+    "系统繁忙" => "System Busy",
+    "请选择操作币种" => "Please Select a Token",
+    "操作频繁" => "Operations Frequent",
+    "已清仓，请查看交易记录详情" => "Closed，Please Check History",
+    "清仓失败" => "Closing Failed",
+    "请输入补仓数量" => "Please Enter the Amount",
+    "交易币种不存在" => "Invalid Token",
+    "请开启策略" => "Please On Stategy",
+    "加仓成功" => "Succeed",
+    "请输入设置的补仓最低余额限制" => "Please Enter Minimum Adding Volume",
+];