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/learn/kod/data/User/demo/data/config.php

@@ -0,0 +1,13 @@
+<?php exit;?>{
+    "listType": "icon",
+    "listSortField": "name",
+    "listSortOrder": "up",
+    "fileIconSize": "80",
+    "animateOpen": "1",
+    "soundOpen": "0",
+    "theme": "win10",
+    "wall": "8",
+    "fileRepeat": "replace",
+    "recycleOpen": "1",
+    "resizeConfig": "{\"filename\":250,\"filetype\":80,\"filesize\":80,\"filetime\":215,\"editorTreeWidth\":200,\"explorerTreeWidth\":200}"
+}