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-daterangepicker/example/browserify/README.md

@@ -0,0 +1,11 @@
+# Browserify example
+
+Two steps need to be done for this to work
+
+In the project root
+
+    npm install
+
+In this folder
+
+    ../../node_modules/.bin/browserify main.js -o bundle.js