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

public/assets/libs/bootstrap-table/dist/extensions/page-jumpto/README.md

@@ -0,0 +1,32 @@
+# Table Jump-to
+
+## Usage
+
+```html
+<link rel="stylesheet" href="extensions/page-jumpto/bootstrap-table-jumpto.css"></style>
+<script src="extensions/page-jumpto/bootstrap-table-jumpto.js"></script>
+```
+
+## Options
+
+### showJumpto
+
+* type: Boolean
+* description: Set true to enable show 'jump to page'. can be defined via `data-show-jumpto` HTML attributes.
+* default: `false`
+* button style: can be styled via bootstrap-table buttonsClass attributes.
+
+````html
+<table id="my_table_id"
+  data-url="data/url.json"
+  data-id-field="id"
+  data-show-jumpto="true">
+  <thead>
+    <tr>
+      <th class="col-md-1" data-field="id" data-sortable="true" data-align="center">#</th>
+      <th class="col-md-4" data-field="name" data-editable="true">Name</th>
+      <th class="col-md-7" data-field="description" data-editable="true" data-editable-emptytext="Custom empty text.">Description</th>
+    </tr>
+  </thead>
+</table>
+````