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/extensionsTS/LightBoxContextMenu.css

@@ -0,0 +1,45 @@
+/* CSS for the lightbox context menu */
+/* see also LightBoxContextMenu.js and samples/htmlLightBoxContextMenu.html */
+#contextMenuDIV {
+
+}
+
+#cmLight {
+  top: 0px;
+  z-index:10002;
+  position: fixed;
+  text-align: center;
+  left: 25%;
+  width: 50%;
+  background-color: #F5F5F5;
+  padding: 16px;
+  border: 16px solid #444;
+  border-radius: 10px;
+  margin-top: 10px;
+}
+
+#cmDark {
+  z-index:10001;
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background-color: black;
+  opacity: 0.8;
+}
+
+#cmLight ul { list-style: none; }
+#cmLight li {
+  font:700 1.5em Helvetica, Arial, sans-serif;
+  position: relative;
+  min-width: 60px; }
+#cmLight a {
+  color: #444;
+  display: inline-block;
+  padding: 4px;
+  text-decoration: none;
+  margin: 2px;
+  border: 1px solid gray;
+  border-radius: 10px;
+}