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

bower.json

@@ -0,0 +1,34 @@
+{
+  "name": "fastadmin",
+  "description": "the fastest admin framework",
+  "main": "",
+  "license": "Apache2.0",
+  "homepage": "https://www.fastadmin.net",
+  "private": true,
+  "dependencies": {
+    "jquery": "^2.1.4",
+    "bootstrap": "^3.3.7",
+    "font-awesome": "^4.6.1",
+    "bootstrap-table": "fastadmin-bootstraptable#~1.11.5",
+    "jstree": "~3.3.2",
+    "moment": "~2.29.0",
+    "toastr": "~2.1.3",
+    "eonasdan-bootstrap-datetimepicker": "~4.17.43",
+    "bootstrap-select": "~1.11.2",
+    "require-css": "~0.1.8",
+    "tableExport.jquery.plugin": "~1.10.3",
+    "jquery-slimscroll": "~1.3.8",
+    "jquery.cookie": "~1.4.1",
+    "Sortable": "~1.10.0",
+    "nice-validator": "~1.1.1",
+    "art-template": "~3.1.3",
+    "bootstrap-daterangepicker": "~2.1.25",
+    "fastadmin-citypicker": "~1.3.1",
+    "fastadmin-cxselect": "~1.4.0",
+    "fastadmin-dragsort": "~1.0.0",
+    "fastadmin-addtabs": "~1.0.5",
+    "fastadmin-selectpage": "~1.0.0",
+    "fastadmin-layer": "~3.1.2",
+    "bootstrap-slider": "*"
+  }
+}