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/urd/contract.php

@@ -0,0 +1,26 @@
+<?php
+
+return [
+    "请先完成实名认证" => "Please Complete KYC Verification",
+    "请选择交易模式" => "Select Type Trading",
+    "限价模式，请输入价格" => "Limited，Enter the Price",
+    "请选择交易币种" => "Select Token",
+    "该交易币种已下架或不存在" => "Unavailable Token",
+    "请选择交易方向" => "Please Select Side",
+    "请输入交易数量" => "Please Enter Amount",
+    "请选择交易倍数" => "Please Select Cast",
+    "请选择正确的交易倍数" => "Invalid Selected Cast",
+    "操作频繁" => "Operations Frequent",
+    "账号余额不足" => "Low Balance",
+    "系统繁忙" => "System Pending",
+    "提交成功" => "Succeed",
+    "请选择设置的合约订单" => "Please Select Futures Order has been Set",
+    "合约订单不存在或已平仓" => "Order Unavailable or Closed",
+    "请设置止盈价格" => "Please Setting Takeprofit's Price",
+    "请设置止损价格" => "Please Setting Stop-loss Price",
+    "设置成功" => "Succed",
+    "请选择合约订单" => "Please Futures Order",
+    "已平仓" => "Closed",
+    "已撤销" => "Canceled",
+    "未查询到币种信息" => "Invalid",
+];