fix: 禁止所有模态框点击外部关闭，防止数据丢失

移除 channels 编辑/同步、TopUpModal、OrderDetail、RefundDialog
四处模态框 backdrop 上的 onClick 关闭行为及 stopPropagation，
用户只能通过显式关闭按钮或取消按钮关闭弹窗。

同时新增支付宝直连和微信支付直连接入文档。

src/components/admin/OrderDetail.tsx

@@ -167,10 +167,9 @@ export default function OrderDetail({ order, onClose, dark, locale = 'zh' }: Ord
   }
 
   return (
-    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50" onClick={onClose}>
+    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
       <div
         className={`max-h-[80vh] w-full max-w-2xl overflow-y-auto rounded-xl p-6 shadow-xl ${dark ? 'bg-slate-800 text-slate-100' : 'bg-white'}`}
-        onClick={(e) => e.stopPropagation()}
       >
         <div className="mb-4 flex items-center justify-between">
           <h3 className="text-lg font-bold">{text.title}</h3>

src/components/admin/RefundDialog.tsx

@@ -72,10 +72,9 @@ export default function RefundDialog({
   };
 
   return (
-    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50" onClick={onCancel}>
+    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
       <div
         className={['w-full max-w-md rounded-xl p-6 shadow-xl', dark ? 'bg-slate-900' : 'bg-white'].join(' ')}
-        onClick={(e) => e.stopPropagation()}
       >
         <h3 className={['text-lg font-bold', dark ? 'text-slate-100' : 'text-gray-900'].join(' ')}>{text.title}</h3>