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/view/auth/adminlog/detail.html

@@ -0,0 +1,27 @@
+<style>
+    .table-adminlog tr td {
+        word-break: break-all;
+    }
+</style>
+<table class="table table-striped table-adminlog">
+    <thead>
+    <tr>
+        <th width="100">{:__('Title')}</th>
+        <th>{:__('Content')}</th>
+    </tr>
+    </thead>
+    <tbody>
+    {volist name="row" id="vo" }
+    <tr>
+        <td>{:__($key)}</td>
+        <td>{if $key=='createtime'}{$vo|datetime}{else/}{$vo|htmlentities}{/if}</td>
+    </tr>
+    {/volist}
+    </tbody>
+</table>
+<div class="hide layer-footer">
+    <label class="control-label col-xs-12 col-sm-2"></label>
+    <div class="col-xs-12 col-sm-8">
+        <button type="reset" class="btn btn-primary btn-embossed btn-close" onclick="Layer.closeAll();">{:__('Close')}</button>
+    </div>
+</div>