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/dashboard.php

@@ -0,0 +1,47 @@
+<?php
+
+return [
+    'Custom'                  => '自定义',
+    'Pid'                     => '父ID',
+    'Type'                    => '栏目类型',
+    'Image'                   => '图片',
+    'Total user'              => '总会员数',
+    'Total view'              => '总访问数',
+    'Total order'             => '总订单数',
+    'Total order amount'      => '总金额',
+    'Today user signup'       => '今日注册',
+    'Today user login'        => '今日登录',
+    'Today order'             => '今日订单',
+    'Unsettle order'          => '未处理订单',
+    'Seven dnu'               => '七日新增',
+    'Seven dau'               => '七日活跃',
+    'Custom zone'             => '这里是你的自定义数据',
+    'Sales'                   => '成交数',
+    'Orders'                  => '订单数',
+    'Real time'               => '实时',
+    'Category count'          => '分类统计',
+    'Category count tips'     => '当前分类总记录数',
+    'Attachment count'        => '附件统计',
+    'Attachment count tips'   => '当前上传的附件数量',
+    'Article count'           => '文章统计',
+    'News count'              => '新闻统计',
+    'Comment count'           => '评论次数',
+    'Like count'              => '点赞次数',
+    'Recent news'             => '最新新闻',
+    'Recent discussion'       => '最新发贴',
+    'Server info'             => '服务器信息',
+    'PHP version'             => 'PHP版本',
+    'Fastadmin version'       => '主框架版本',
+    'Fastadmin addon version' => '插件版本',
+    'Thinkphp version'        => 'ThinkPHP版本',
+    'Sapi name'               => '运行方式',
+    'Debug mode'              => '调试模式',
+    'Software'                => '环境信息',
+    'Upload mode'             => '上传模式',
+    'Upload url'              => '上传URL',
+    'Upload cdn url'          => '上传CDN',
+    'Cdn url'                 => '静态资源CDN',
+    'Timezone'                => '时区',
+    'Language'                => '语言',
+    'View more'               => '查看更多',
+];