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/FAQ.md

@@ -0,0 +1,28 @@
+# Frequently asked questions
+
+_This document is a work in progress and it is used to collect common questions._
+
+## How to import moment in TypeScript?
+
+### Have trouble importing moment?
+
+If your tsconfig.json contains the following config, you must do the default import workflow `import moment from 'moment'`:
+
+```json
+// tsconfig.json
+// https://www.typescriptlang.org/v2/docs/handbook/release-notes/typescript-2-7.html
+{ 
+  "compilerOptions": {
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+  }
+}
+```
+
+If you don't have these config above, the default import won't work, and you'll continue to have to use `import * as moment from 'moment'`.
+
+Note: It is recommended to use `import moment from 'moment'`.
+
+### Case and Program
+
+Known cases so far: [#5444](https://github.com/moment/moment/issues/5444), [#5248](https://github.com/moment/moment/issues/5348) and [#5449](https://github.com/moment/moment/issues/5449).