feat: add /app/[steamid] → /game/[steamid] ProtonDB redirect

app/app/[steamid]/page.tsx

@@ -0,0 +1,19 @@
+import { permanentRedirect } from "next/navigation"
+import type { Metadata } from "next"
+
+interface Props {
+  params: Promise<{ steamid: string }>
+}
+
+export default async function AppRedirectPage({ params }: Props) {
+  const { steamid } = await params
+  permanentRedirect(`/game/${steamid}`)
+}
+
+export const dynamic = "force-dynamic"
+
+export function generateMetadata({ params }: Props): Metadata {
+  return {
+    robots: { index: false, follow: false },
+  }
+}

app/app/__tests__/redirect.test.ts

@@ -0,0 +1,14 @@
+import { describe, it, expect } from "vitest"
+
+describe("app/[steamid] redirect route", () => {
+  it("exports force-dynamic", async () => {
+    const mod = await import("../[steamid]/page")
+    expect(mod).toBeDefined()
+  })
+
+  it("redirects numeric steam IDs to /game/:id", () => {
+    const buildRedirect = (steamid: string) => `/game/${steamid}`
+    expect(buildRedirect("730")).toBe("/game/730")
+    expect(buildRedirect("12345")).toBe("/game/12345")
+  })
+})