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

lib/pinball/keyBindings.ts

@@ -0,0 +1,11 @@
+export interface KeyBinding {
+  keys: string;
+  action: string;
+}
+
+export const KEY_BINDINGS: KeyBinding[] = [
+  { keys: "Left Shift", action: "Left flipper" },
+  { keys: "Right Shift", action: "Right flipper" },
+  { keys: "Enter", action: "Plunger" },
+  { keys: "1", action: "Start game" },
+];