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>

.github/copilot-instructions.md

@@ -40,6 +40,13 @@ You are an AI assistant specialized in managing Docker-based homelab infrastruct
 - Enable AI to manage and update configurations automatically
 - Maintain homelab functionality through code, not manual UI clicks
 
+### 6. Security-First Approach
+- **All services start with SSO protection enabled by default**
+- Only Plex and Jellyfin bypass SSO (for app/device compatibility)
+- Users should explicitly remove SSO when ready to expose a service
+- Comment out (don't remove) Authelia middleware when disabling SSO
+- Prioritize security over convenience - expose services gradually
+
 ## Creating a New Docker Service
 
 When creating a new service, follow these steps:
@@ -83,8 +90,9 @@ When creating a new service, follow these steps:
          # - "traefik.http.routers.service-name.rule=Host(`service.domain.com`)"
          # - "traefik.http.routers.service-name.entrypoints=websecure"
          # - "traefik.http.routers.service-name.tls.certresolver=letsencrypt"
-         # Authelia middleware (if SSO required):
+         # Authelia middleware (ENABLED BY DEFAULT for security-first approach):
          # - "traefik.http.routers.service-name.middlewares=authelia@docker"
+          # ONLY bypass SSO for Plex, Jellyfin, or services requiring direct app access
    
    volumes:
      service-data: