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

addons/btpanel/bootstrap.js

@@ -0,0 +1,12 @@
+require.config({
+    paths: {
+        knob: "../addons/btpanel/js/jquery.knob",
+        codemirror: "../addons/btpanel/js/codemirror",
+        loading: "../addons/btpanel/js/loading",
+    },
+    shim: {
+        knob: ['jquery'],
+        codemirror: ['css!../addons/btpanel/js/codemirror.css'],
+        loading: ['jquery']
+    }
+});