refactor: remove hardcoded display values and unused lib/id.ts

Delete hardcoded marketing stats in auth layout and ¥12,800
placeholder in owner dashboard. Remove lib/id.ts which is no
longer referenced by any module.

app/(auth)/layout.tsx

@@ -1,12 +1,6 @@
 import { ArrowLeft, Gamepad2 } from "lucide-react"
 import Link from "next/link"
 
-const stats = [
-  { value: "12,000+", label: "认证打手" },
-  { value: "98.6%", label: "好评率" },
-  { value: "50,000+", label: "完成订单" },
-]
-
 export default function AuthLayout({ children }: { children: React.ReactNode }) {
   return (
     <div className="flex min-h-screen bg-background">
@@ -28,15 +22,6 @@ export default function AuthLayout({ children }: { children: React.ReactNode })
           <p className="mt-4 text-base leading-relaxed text-muted-foreground">
             聚玩连接玩家与专业打手，提供安全、透明、高效的游戏陪玩服务。无论你是寻找搭档还是展示技能，这里都是你的舞台。
           </p>
-
-          <div className="mt-10 grid grid-cols-3 gap-6">
-            {stats.map((stat) => (
-              <div key={stat.label}>
-                <div className="text-2xl font-bold">{stat.value}</div>
-                <div className="mt-1 text-xs text-muted-foreground">{stat.label}</div>
-              </div>
-            ))}
-          </div>
         </div>
 
         <div className="text-xs text-muted-foreground">&copy; 2025 聚玩. All rights reserved.</div>