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/css/iconfont.css

@@ -0,0 +1,25 @@
+
+@font-face {font-family: "iconfont";
+  src: url('../fonts/iconfont/iconfont.eot?t=1487643189178'); /* IE9*/
+  src: url('../fonts/iconfont/iconfont.eot?t=1487643189178#iefix') format('embedded-opentype'), /* IE6-IE8 */
+  url('../fonts/iconfont/iconfont.woff?t=1487643189178') format('woff'), /* chrome, firefox */
+  url('../fonts/iconfont/iconfont.ttf?t=1487643189178') format('truetype'), /* chrome, firefox, opera, Safari, Android, iOS 4.2+*/
+  url('../fonts/iconfont/iconfont.svg?t=1487643189178#iconfont') format('svg'); /* iOS 4.1- */
+}
+
+.iconfont {
+  font-family:"iconfont" !important;
+  font-size:16px;
+  font-style:normal;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+.icon-max:before { content: "\e623"; }
+
+.icon-restore:before { content: "\e624"; }
+
+.icon-min:before { content: "\e625"; }
+
+.icon-close:before { content: "\e626"; }
+