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/admin/lang/zh-cn/app/app_ai_strategy.php

@@ -0,0 +1,35 @@
+<?php
+
+return [
+    'Id'          => 'id',
+    'User_id'     => '用户',
+    'Coin_id'     => '币种',
+    'Status'      => '状态',
+    'Status 0'    => '关闭',
+    'Status 1'    => '开启',
+    'First_num'   => '首单额度',
+    'Num'         => '做单数量',
+    'Zy_percent'  => '止盈比例',
+    'Zy_ht'       => '止盈回调',
+    'Bcjson'      => '补仓回调',
+    'Bc_ht'       => '补仓回调',
+    'Cc_price'    => '持仓均价',
+    'Cc_num'      => '持仓数量',
+    'Cc_amount'   => '持仓金额',
+    'Type'        => '类型',
+    'Type 1'      => '单次',
+    'Type 2'      => '循环',
+    'Is_double'   => '倍投',
+    'Is_double 0' => '关闭',
+    'Is_double 1' => '开启',
+    'Double_max'  => '倍投上限',
+    'Pc_status'   => '停止补仓',
+    'Pc_status 0' => '正常补仓',
+    'Pc_status 1' => '停止补仓',
+    'In_price'    => '入场金额',
+    'Createtime'  => '创建时间',
+    'Updatetime'  => '持仓数量',
+    'Is_now'      => '是否立即入场',
+    'Is_now 0'    => '否',
+    'Is_now 1'    => '是'
+];