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/bower.json

@@ -0,0 +1,34 @@
+{
+  "name": "bootstrap",
+  "description": "The most popular front-end framework for developing responsive, mobile first projects on the web.",
+  "keywords": [
+    "css",
+    "js",
+    "less",
+    "mobile-first",
+    "responsive",
+    "front-end",
+    "framework",
+    "web"
+  ],
+  "homepage": "https://getbootstrap.com/",
+  "license": "MIT",
+  "moduleType": "globals",
+  "main": [
+    "less/bootstrap.less",
+    "dist/js/bootstrap.js"
+  ],
+  "ignore": [
+    "/.*",
+    "_config.yml",
+    "CNAME",
+    "composer.json",
+    "CONTRIBUTING.md",
+    "docs",
+    "js/tests",
+    "test-infra"
+  ],
+  "dependencies": {
+    "jquery": "1.9.1 - 3"
+  }
+}