Add Authentik SSO, fix Uptime Kuma duplicate, enable SSO on Jellyseerr, and improve documentation

- Add Authentik service stack to infrastructure.yml
  - Includes Authentik server, worker, PostgreSQL database, and Redis
  - Alternative SSO with web UI for user management
  - Access at authentik.${DOMAIN}
  - Protected by Authelia SSO (comment out to use standalone)

- Fix Uptime Kuma duplicate listing
  - Remove from utilities.yml
  - Keep only in monitoring.yml where it belongs
  - Add Traefik labels and SSO protection to monitoring instance

- Enable SSO on Jellyseerr by default
  - Changed from bypass to protected (security-first approach)
  - Users can comment out SSO if needed for public access

- Update SSO toggling documentation
  - Emphasize commenting out (not removing) middleware line
  - Add docker command examples for running from outside stack folder
  - Show both "cd to directory" and "full path" methods
  - Add examples for starting and stopping services multiple ways

- Enhance security-first methodology
  - Update copilot instructions to default SSO to enabled
  - Only Plex and Jellyfin bypass SSO by default
  - All other services start secured, expose gradually
  - Emphasize commenting (not removing) for easier re-enable

- Update services-reference.md
  - Add Authentik to infrastructure section (12 services)
  - Move Uptime Kuma to monitoring section (8 services)
  - Remove from utilities (now 6 services)
  - Update Jellyseerr SSO status from ✗ to ✓
  - Improve Authentik documentation with deployment guidance

- Add Authentik environment variables to .env.example
  - AUTHENTIK_SECRET_KEY, DB credentials
  - Generation instructions included

All changes align with security-first principle: start secure, expose services only when ready for deployment.

Co-authored-by: kelinfoxy <67766943+kelinfoxy@users.noreply.github.com>

.env.example

@@ -37,6 +37,13 @@ AUTHELIA_STORAGE_ENCRYPTION_KEY=your-encryption-key-here-64-chars
 SMTP_USERNAME=your-email@example.com
 SMTP_PASSWORD=your-smtp-password
 
+# Authentik SSO (optional - alternative to Authelia with web UI)
+# Generate secrets with: openssl rand -hex 50
+AUTHENTIK_SECRET_KEY=your-authentik-secret-key-here-100-chars
+AUTHENTIK_DB_USER=authentik
+AUTHENTIK_DB_PASSWORD=changeme-authentik-db-password
+AUTHENTIK_DB_NAME=authentik
+
 # VPN Configuration (Surfshark)
 # Get WireGuard details from Surfshark dashboard
 SURFSHARK_PRIVATE_KEY=your-wireguard-private-key