Add vpinball: a browser Visual Pinball player

Next.js app that plays real .vpx tables via @valknar/vpinball-wasm
(WebAssembly Visual Pinball). Demo mode with the bundled default
table, drag-and-drop custom table upload, a cabinet-styled UI with a
coin-door HUD (fullscreen/stats/info/eject), a custom 404 page, PWA
support (hand-rolled service worker), and a static Docker Compose
deployment behind nginx.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012hQoM3jJT1Lx7CMTciMzvD

scripts/copy-engine-assets.mjs

@@ -0,0 +1,26 @@
+#!/usr/bin/env node
+// Copies the vpinball-wasm engine's build output into public/vendor/vpinball-wasm/
+// so it's served as plain static files (see lib/pinball/usePinballInstance.ts for why:
+// the package's own loadPinball() does a dynamic import() of its glue script that must
+// never pass through webpack's module graph).
+import { cp, mkdir, rm } from "node:fs/promises";
+import { existsSync } from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const rootDir = path.dirname(path.dirname(fileURLToPath(import.meta.url)));
+const pkgDistDir = path.join(rootDir, "node_modules", "@valknar", "vpinball-wasm", "dist");
+const targetDir = path.join(rootDir, "public", "vendor", "vpinball-wasm");
+
+if (!existsSync(pkgDistDir)) {
+  console.error(
+    `vpinball-wasm not found at ${pkgDistDir} — run "pnpm install" first.`,
+  );
+  process.exit(1);
+}
+
+await rm(targetDir, { recursive: true, force: true });
+await mkdir(targetDir, { recursive: true });
+await cp(pkgDistDir, targetDir, { recursive: true });
+
+console.log(`Copied vpinball-wasm engine assets to ${path.relative(rootDir, targetDir)}/`);