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/index.php

@@ -0,0 +1,20 @@
+<?php
+
+return [
+    "内容不存在" => "Invalid Content",
+    "请选择要查询的榜单" => "Please Select Ranking",
+    "私募不存在" => "Invalid ICO",
+    "非预约时间" => "Invalid Appoint Time",
+    "请勿重复预约" => "Please Do Not Repeat Appoinment",
+    "预约成功" => "Appoinment Succeed",
+    "交易密码错误" => "Trading Password Wrong",
+    "非私募时间" => "Invalid ICO Time",
+    "请输入有效数量" => "Please Enter Correct Amount",
+    "可私募数量不足" => "Invalid ICO Volume",
+    "余额不足" => "Balance Low",
+    "操作频繁" => "Operations Frequent",
+    "私募成功" => "Succeed",
+    "周期不存在" => "Invalid Period Time",
+    "锁仓成功" => "Succeed",
+    "记录不存在" => "Invalid History",
+];