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.

deploy/README.md

@@ -0,0 +1,34 @@
+# Raspberry Pi deployment
+
+## 1. Install Node 20+ and clone the repo
+```bash
+curl -fsSL https://deb.nodesource.com/setup_20.x | sudo -E bash -
+sudo apt-get install -y nodejs build-essential python3
+git clone <repo> /home/pi/onlineRadioExplorer
+cd /home/pi/onlineRadioExplorer
+cp .env.example .env  # edit secrets
+npm ci
+npm run build
+```
+
+## 2. Service
+```bash
+sudo cp deploy/oradio.service /etc/systemd/system/oradio.service
+sudo systemctl daemon-reload
+sudo systemctl enable --now oradio
+journalctl -u oradio -f
+```
+
+App listens on `PORT` (default 4173). Open `http://<pi-ip>:4173/` for the kiosk
+and `http://<pi-ip>:4173/admin/` for admin.
+
+## 3. Kiosk autostart (Chromium on Raspberry Pi OS)
+Edit `~/.config/lxsession/LXDE-pi/autostart` (or wayfire `[autostart]`):
+
+```
+@chromium-browser --kiosk --noerrdialogs --disable-infobars --app=http://localhost:4173/
+```
+
+Rotate the touchscreen to portrait via `/boot/firmware/config.txt`
+(`display_rotate=1`) or via the desktop display settings, then size the kiosk
+window/area to the 1080×660 region you reserved.

deploy/oradio.service

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+[Unit]
+Description=Online Radio Explorer
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=pi
+WorkingDirectory=/home/pi/onlineRadioExplorer
+EnvironmentFile=/home/pi/onlineRadioExplorer/.env
+ExecStart=/usr/bin/node server/index.js
+Restart=on-failure
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target