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/.bower.json

@@ -0,0 +1,31 @@
+{
+  "name": "bootstrap-daterangepicker",
+  "main": [
+    "daterangepicker.js",
+    "daterangepicker.css"
+  ],
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "bower_components",
+    "test",
+    "tests",
+    "moment.js",
+    "moment.min.js"
+  ],
+  "dependencies": {
+    "jquery": "1.9.1 - 3",
+    "moment": ">=2.9.0"
+  },
+  "homepage": "https://github.com/dangrossman/bootstrap-daterangepicker",
+  "version": "2.1.27",
+  "_release": "2.1.27",
+  "_resolution": {
+    "type": "version",
+    "tag": "v2.1.27",
+    "commit": "d4aabfbceaf57117e1af33f3f82e92162719eee9"
+  },
+  "_source": "https://github.com/dangrossman/bootstrap-daterangepicker.git",
+  "_target": "~2.1.25",
+  "_originalSource": "bootstrap-daterangepicker"
+}