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

docker/nginx.conf

@@ -0,0 +1,49 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # nginx only sees its own container-internal port (80) and has no idea
+    # docker-compose maps that to some other host port — an absolute redirect
+    # (e.g. nginx's own trailing-slash directory redirect) would silently
+    # drop that external port from the Location header. A relative Location
+    # lets the browser resolve it against whatever host:port it's already on.
+    absolute_redirect off;
+
+    # The stock /etc/nginx/mime.types (included by the base image's own
+    # nginx.conf) already maps .wasm/.woff2/.html correctly. .webmanifest
+    # isn't in it, so it's set per-location below rather than via a
+    # server-level types{} block, which would replace that whole map instead
+    # of extending it. .data has no meaningful type of its own and correctly
+    # falls through to the base config's default_type (application/octet-stream).
+    location = /manifest.webmanifest {
+        default_type application/manifest+json;
+        add_header Cache-Control "no-cache";
+    }
+
+    location = /sw.js {
+        add_header Cache-Control "no-cache";
+    }
+
+    # Large, effectively-immutable engine binaries — keep gzip off so nginx
+    # can still serve byte-range/If-Range requests (on-the-fly gzip disables
+    # range serving), and cache them aggressively.
+    location /vendor/vpinball-wasm/ {
+        gzip off;
+        add_header Cache-Control "public, max-age=31536000, immutable";
+    }
+
+    # error_page preserves the 404 status while serving the prerendered
+    # not-found page's content — a bare `try_files ... /404.html;` fallback
+    # would serve that same content with a 200, since try_files treats an
+    # existing fallback file as a normal successful response.
+    error_page 404 /404.html;
+    location = /404.html {
+        internal;
+    }
+
+    location / {
+        try_files $uri $uri/ $uri.html =404;
+    }
+}