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/toastr/.bower.json

@@ -0,0 +1,22 @@
+{
+  "name": "toastr",
+  "version": "2.1.3",
+  "main": [
+    "toastr.js",
+    "toastr.css"
+  ],
+  "dependencies": {
+    "jquery": ">=1.6.3 <3"
+  },
+  "license": "MIT",
+  "homepage": "https://github.com/johnpapa/toastr-bower",
+  "_release": "2.1.3",
+  "_resolution": {
+    "type": "version",
+    "tag": "2.1.3",
+    "commit": "d6fef68471aa1836bc44ba1a41a90a96548b784f"
+  },
+  "_source": "https://github.com/johnpapa/toastr-bower.git",
+  "_target": "~2.1.3",
+  "_originalSource": "toastr"
+}