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/picasa/static/main.js

@@ -0,0 +1,15 @@
+kodReady.push(function(){
+	kodApp.add({
+		name:"picasa",
+		title:"{{LNG.Plugin.default.picasa}}",
+		ext:"{{config.fileExt}}",
+		sort:"{{config.fileSort}}",
+		icon:"x-item-file x-png",
+		callback:function(imagePath,ext){
+			var appStatic = "{{pluginHost}}static/";
+			require.async(appStatic+'page.js',function(app){
+				app(imagePath,appStatic)
+			});
+		}
+	});
+});