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/send/main.tf

@@ -114,9 +114,5 @@ module "ingress" {
   name            = "send"
   tls_secret_name = var.tls_secret_name
   port            = 1443
-  extra_annotations = {
-    "nginx.ingress.kubernetes.io/client-max-body-size" : "0"
-    "nginx.ingress.kubernetes.io/proxy-body-size" : "0",
-  }
-  rybbit_site_id = "c1b8f8aa831b"
+  rybbit_site_id  = "c1b8f8aa831b"
 }