style: redesign hero section and auth split layout

app/(auth)/register/page.tsx

@@ -42,10 +42,15 @@ export default function RegisterPage() {
   }
 
   return (
-    <div className="space-y-6">
-      <div className="flex flex-col items-center gap-2">
-        <Gamepad2 className="h-8 w-8" />
-        <h1 className="text-2xl font-bold">注册聚玩</h1>
+    <div className="space-y-8 bg-background p-8 rounded-xl border shadow-sm md:border-0 md:shadow-none md:p-0">
+      <div className="flex flex-col gap-2">
+        <div className="flex items-center gap-2 md:hidden mb-4">
+          <div className="rounded-lg bg-primary/10 p-2">
+            <Gamepad2 className="h-6 w-6 text-primary" />
+          </div>
+          <span className="text-xl font-bold">聚玩</span>
+        </div>
+        <h1 className="text-2xl font-bold tracking-tight">创建账号</h1>
         <p className="text-sm text-muted-foreground">创建你的聚玩账号</p>
       </div>
       <form onSubmit={handleSubmit(onSubmit)} className="space-y-4">