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

public/icons/icon-source.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" fill="#0b0b0f"/>
+  <circle cx="256" cy="256" r="200" fill="none" stroke="#4ce0d2" stroke-width="10" opacity="0.35"/>
+  <circle cx="256" cy="216" r="96" fill="#ff7a29"/>
+  <circle cx="222" cy="182" r="26" fill="#ffd7ad" opacity="0.55"/>
+  <path d="M 116 372 Q 256 300 396 372 L 396 392 Q 256 340 116 392 Z" fill="#a9aebb"/>
+</svg>

public/icons/icon.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" fill="#0b0b0f"/>
+  <circle cx="256" cy="256" r="200" fill="none" stroke="#4ce0d2" stroke-width="10" opacity="0.35"/>
+  <circle cx="256" cy="216" r="96" fill="#ff7a29"/>
+  <circle cx="222" cy="182" r="26" fill="#ffd7ad" opacity="0.55"/>
+  <path d="M 116 372 Q 256 300 396 372 L 396 392 Q 256 340 116 392 Z" fill="#a9aebb"/>
+</svg>