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/Sortable/entry/entry-complete.js

@@ -0,0 +1,8 @@
+import Sortable from './entry-defaults.js';
+import Swap from '../plugins/Swap';
+import MultiDrag from '../plugins/MultiDrag';
+
+Sortable.mount(new Swap());
+Sortable.mount(new MultiDrag());
+
+export default Sortable;

public/assets/libs/Sortable/entry/entry-core.js

@@ -0,0 +1,19 @@
+import Sortable from '../src/Sortable.js';
+import AutoScroll from '../plugins/AutoScroll';
+import OnSpill from '../plugins/OnSpill';
+import Swap from '../plugins/Swap';
+import MultiDrag from '../plugins/MultiDrag';
+
+export default Sortable;
+
+export {
+	Sortable,
+
+	// Default
+	AutoScroll,
+	OnSpill,
+
+	// Extra
+	Swap,
+	MultiDrag
+};

public/assets/libs/Sortable/entry/entry-defaults.js

@@ -0,0 +1,19 @@
+import Sortable from '../src/Sortable.js';
+import AutoScroll from '../plugins/AutoScroll';
+import { RemoveOnSpill, RevertOnSpill } from '../plugins/OnSpill';
+// Extra
+import Swap from '../plugins/Swap';
+import MultiDrag from '../plugins/MultiDrag';
+
+Sortable.mount(new AutoScroll());
+Sortable.mount(RemoveOnSpill, RevertOnSpill);
+
+export default Sortable;
+
+export {
+	Sortable,
+
+	// Extra
+	Swap,
+	MultiDrag
+};