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

Dockerfile

@@ -0,0 +1,20 @@
+# syntax=docker/dockerfile:1
+FROM node:22-alpine AS base
+ENV CI=true
+RUN corepack enable
+
+FROM base AS deps
+WORKDIR /app
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml* .npmrc* ./
+RUN pnpm install --frozen-lockfile --trust-lockfile
+
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN pnpm build
+
+FROM nginx:1.27-alpine AS runner
+COPY --from=builder /app/out /usr/share/nginx/html
+COPY docker/nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80