Add strip-auth-headers Traefik middleware that removes X-authentik-*
headers from requests before they reach the backend. Backends like
iDRAC and TP-Link gateway break when receiving these extra headers.
- Add insecureSkipVerify=true globally for self-signed backend certs
- Name service ports with https- prefix for HTTPS backends so Traefik uses HTTPS
- Add ServersTransport CRD for per-service insecureSkipVerify
- Add serversscheme/serverstransport annotations to reverse-proxy factory
- Remove nginx-specific ingress variables (use_proxy_protocol, proxy_timeout, additional_configuration_snippet)
- Update ingress annotations to use Traefik middleware CRDs
- Delete nginx-ingress module (replaced by traefik)
- Add new traefik middleware.tf for shared middleware definitions
- Update service modules to work with new ingress_factory interface
