Migrate all service modules from nginx-ingress to Traefik

- 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

modules/kubernetes/ebook2audiobook/main.tf

@@ -405,6 +405,5 @@ module "audiblez-web-ingress" {
   tls_secret_name = var.tls_secret_name
   protected       = true
   max_body_size   = "500m" # Allow large EPUB uploads
-  proxy_timeout   = 3600   # Long timeout for conversions
 }