fix(meshcentral): disable anti-AI middleware causing 500 errors

The rewrite-body plugin (anti-AI trap links) was crashing when
processing MeshCentral's HTML responses, returning 500. Disabled
anti_ai_scraping since it's a protected internal tool behind Authentik.
Re-enabled Authentik protection.

stacks/meshcentral/main.tf

@@ -237,7 +237,8 @@ module "ingress" {
   name            = "meshcentral"
   tls_secret_name = var.tls_secret_name
   port            = 443
-  protected       = true
+  protected         = true
+  anti_ai_scraping  = false
   extra_annotations = {
     "gethomepage.dev/enabled"      = "true"
     "gethomepage.dev/name"         = "MeshCentral"