chore: scaffold vite react-three project

Establish initial project structure for LE BUS (clement.saillant.cc),
a demoscene-style personal identity hub built with Vite, React, and
react-three-fiber.

Changes:
- Add package.json with dependencies (React 19, Three.js,
  react-three/fiber, zustand, playwright for e2e)
- Add tsconfig.json with ES2022 target and react-jsx support
- Add vite.config.ts with React plugin
- Add minimal index.html, src/main.tsx, and src/style.css
- Add README.md with usage commands
- Add .gitignore (node_modules, dist, test artifacts, .DS_Store)
- Generate package-lock.json via npm install

Note: chiptune3 removed from dependencies (not on npm registry;
will be isolated behind src/audio/modPlayer.ts in Task 11 with mocks).

Build and test harness verified:
- npm run build succeeds → dist/index.html created
- npx vitest run --passWithNoTests exits 0

tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "jsx": "react-jsx",
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "types": ["vite/client"]
+  },
+  "include": ["src", "vite.config.ts", "e2e"]
+}