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/GoJS-master/projects/minimalSource/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "minimalsource",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "ts-loader": "^8.0.2",
+    "typescript": "^3.9.7",
+    "webpack": "^4.44.1",
+    "webpack-cli": "^3.3.12",
+    "webpack-closure-compiler": "^2.1.6"
+  },
+  "devDependencies": {},
+  "author": "Northwoods Software"
+}