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/less/badges.less

@@ -0,0 +1,66 @@
+//
+// Badges
+// --------------------------------------------------
+
+
+// Base class
+.badge {
+  display: inline-block;
+  min-width: 10px;
+  padding: 3px 7px;
+  font-size: @font-size-small;
+  font-weight: @badge-font-weight;
+  line-height: @badge-line-height;
+  color: @badge-color;
+  text-align: center;
+  white-space: nowrap;
+  vertical-align: middle;
+  background-color: @badge-bg;
+  border-radius: @badge-border-radius;
+
+  // Empty badges collapse automatically (not available in IE8)
+  &:empty {
+    display: none;
+  }
+
+  // Quick fix for badges in buttons
+  .btn & {
+    position: relative;
+    top: -1px;
+  }
+
+  .btn-xs &,
+  .btn-group-xs > .btn & {
+    top: 0;
+    padding: 1px 5px;
+  }
+
+  // Hover state, but only for links
+  a& {
+    &:hover,
+    &:focus {
+      color: @badge-link-hover-color;
+      text-decoration: none;
+      cursor: pointer;
+    }
+  }
+
+  // Account for badges in navs
+  .list-group-item.active > &,
+  .nav-pills > .active > a > & {
+    color: @badge-active-color;
+    background-color: @badge-active-bg;
+  }
+
+  .list-group-item > & {
+    float: right;
+  }
+
+  .list-group-item > & + & {
+    margin-right: 5px;
+  }
+
+  .nav-pills > li > a > & {
+    margin-left: 3px;
+  }
+}