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/plugins/simpleClock/static/main.js

@@ -0,0 +1,17 @@
+kodReady.push(function(){
+    if(!$.supportCss3() || isWap()){//ie8 ie9
+        return;
+    }
+	if(lodash.get(window,'Config.pageApp') != 'desktop'){
+		return;
+	}
+	//加载时钟挂件
+	$.artDialog.open("{{pluginApi}}",{
+		title:"clock",
+		top: 40,
+		left:$(window).width() - 210,
+		width:'200px',
+		height:'200px',
+		simple:true
+	});
+});