feat: add Docker support with environment configuration and health checks

.env.docker

@@ -0,0 +1,21 @@
+# Docker Environment Configuration
+# Copy this file to .env and modify the values as needed
+
+# Host configuration
+HOST_PORT=3000
+PORT=3000
+
+# Navidrome Server Configuration (OPTIONAL)
+# If not provided, the app will prompt you to configure these settings
+# NAVIDROME_URL=http://localhost:4533
+# NAVIDROME_USERNAME=your_username
+# NAVIDROME_PASSWORD=your_password
+
+# PostHog Analytics (optional)
+POSTHOG_KEY=
+POSTHOG_HOST=
+
+# Example for external Navidrome server:
+# NAVIDROME_URL=https://your-navidrome-server.com
+# NAVIDROME_USERNAME=your_username
+# NAVIDROME_PASSWORD=your_password