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/bootstrap-table/dist/locale/bootstrap-table-af-ZA.min.js

@@ -0,0 +1,7 @@
+/*
+* bootstrap-table - v1.11.1 - 2017-02-22
+* https://github.com/wenzhixin/bootstrap-table
+* Copyright (c) 2017 zhixin wen
+* Licensed MIT License
+*/
+!function(a){"use strict";a.fn.bootstrapTable.locales["af-ZA"]={formatLoadingMessage:function(){return"Besig om te laai, wag asseblief ..."},formatRecordsPerPage:function(a){return a+" rekords per bladsy"},formatShowingRows:function(a,b,c){return"Resultate "+a+" tot "+b+" van "+c+" rye"},formatSearch:function(){return"Soek"},formatNoMatches:function(){return"Geen rekords gevind nie"},formatPaginationSwitch:function(){return"Wys/verberg bladsy nummering"},formatRefresh:function(){return"Herlaai"},formatToggle:function(){return"Wissel"},formatColumns:function(){return"Kolomme"}},a.extend(a.fn.bootstrapTable.defaults,a.fn.bootstrapTable.locales["af-ZA"])}(jQuery);