feat: add 6 more skins (PS1, PS3, Wii, NDS, Dreamcast, JV2002)

Brings the catalog to nine. Each is a single scoped [data-theme="..."]
CSS file plus a registry entry — no markup changes.

- ps1: charcoal BIOS, gray panels, uppercase letterspacing
- ps3: animated XMB sky gradient + drifting wave, black glass
- wii: white channels, rounded pills, soft blue glow
- nds: silver shell with content framed as the touch screen
- dreamcast: cream BIOS, conic-gradient orange swirl, lowercase blue
- jv2002: dense boxy portal, Verdana 11px, red masthead, blue nav tabs

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/proxy.ts

@@ -0,0 +1,23 @@
+import { NextResponse, type NextRequest } from "next/server";
+import { ADMIN_COOKIE, verifySessionToken } from "@/lib/session";
+
+// Gate every /admin route behind a valid session, except the login page and its
+// POST action. Runs on the Edge runtime, so it relies only on Web Crypto
+// (see lib/session.ts) — no Node APIs.
+export async function proxy(req: NextRequest) {
+  const { pathname } = req.nextUrl;
+
+  if (pathname === "/admin/login") return NextResponse.next();
+
+  const token = req.cookies.get(ADMIN_COOKIE)?.value;
+  if (await verifySessionToken(token)) return NextResponse.next();
+
+  const url = req.nextUrl.clone();
+  url.pathname = "/admin/login";
+  url.searchParams.set("next", pathname);
+  return NextResponse.redirect(url);
+}
+
+export const config = {
+  matcher: ["/admin/:path*"],
+};