Add player functionality with HLS support and API integration

- Implemented a new Player class in player.js to handle audio playback, including HLS support using hls.js.
- Created a shared API module in api.js for making HTTP requests with proper error handling.
- Added DOM utility functions in dom.js for creating and clearing elements.
- Introduced WebSocket connection handling in ws.js for real-time updates.
- Developed a comprehensive CSS stylesheet for styling the application, including a high-contrast theme.

README.md

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+# Online Radio Explorer
+
+Touchscreen kiosk + admin for exploring and playing internet radio in the office.
+
+## Quick start
+
+```powershell
+cp .env.example .env
+npm install
+npm run dev
+```
+
+- Kiosk: http://localhost:5173/
+- Admin: http://localhost:5173/admin/
+- API:   http://localhost:4173/api
+
+First boot creates the SQLite DB at `DB_PATH`, runs the seed, and provisions the
+bootstrap admin from `ADMIN_BOOTSTRAP_USER` / `ADMIN_BOOTSTRAP_PASSWORD`.
+
+## Production
+
+```powershell
+npm run build
+npm start
+```
+
+The built kiosk is served from `/`, admin from `/admin/`, API from `/api`.
+
+## Layout
+
+- `server/` — Express, SQLite, WebSocket hub, source adapters, stream resolver.
+- `web/` — Vanilla JS kiosk (`web/`) and admin (`web/admin/`) bundled by Vite.
+- `data/seed/stations.json` — curated starter pack.
+- `deploy/` — systemd unit + Pi setup notes.