feat!: Add Authelia for authentication and Redis for session storage

- Introduced Redis service for session management with health checks.
- Added Authelia service for user authentication with necessary environment variables.
- Configured Traefik to use Authelia as middleware for various services.
- Created Authelia configuration file with session, storage, and access control settings.
- Added user database for Authelia with an example admin user.

.env.example

@@ -67,13 +67,9 @@ AUTHELIA_SESSION_SECRET= # Example: your_strong_session_secret
 AUTHELIA_STORAGE_ENCRYPTION_KEY= # Example: your_strong_storage_encryption_key
 AUTHELIA_REDIS_PASSWORD= # Example: your_strong_redis_password
 
-# Google OIDC Provider Settings (Get from Google Cloud Console - https://console.cloud.google.com/apis/credentials)
-AUTHELIA_GOOGLE_OIDC_CLIENT_ID= # Example: your-google-client-id.apps.googleusercontent.com
-AUTHELIA_GOOGLE_OIDC_CLIENT_SECRET= # Example: GOCSPX-your-google-client-secret
-
 # Authelia Session Configuration
-AUTHELIA_SESSION_DOMAIN=${TAILSCALE_HOSTNAME}.${TAILSCALE_TAILNET_DOMAIN}
-AUTHELIA_DEFAULT_REDIRECT_URL=https://${TAILSCALE_HOSTNAME}.${TAILSCALE_TAILNET_DOMAIN}/home
+AUTHELIA_SESSION_DOMAIN=${HOSTNAME}
+AUTHELIA_DEFAULT_REDIRECT_URL=https://${HOSTNAME}/home
 
 # --- API Keys & Integration Tokens (Optional - Mainly for Homepage Widgets) ---
 # Find API keys within each application's settings (usually Settings > General or Security)