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/moment/bower.json

@@ -0,0 +1,26 @@
+{
+  "name": "moment",
+  "license": "MIT",
+  "main": "moment.js",
+  "ignore": [
+    "**/.*",
+    "benchmarks",
+    "bower_components",
+    "meteor",
+    "node_modules",
+    "scripts",
+    "tasks",
+    "test",
+    "component.json",
+    "composer.json",
+    "CONTRIBUTING.md",
+    "ender.js",
+    "Gruntfile.js",
+    "Moment.js.nuspec",
+    "package.js",
+    "package.json",
+    "ISSUE_TEMPLATE.md",
+    "typing-tests",
+    "min/tests.js"
+  ]
+}