fix(infra): address PR review feedback on tf modules

Deployer role:
- Add servicediscovery actions; module always creates Cloud Map namespace
  and service so the policy must grant CreatePrivateDnsNamespace etc.
- Make Route53 + ACM permissions unconditional. The server module always
  issues an ACM cert and writes Route53 records (no CloudFront default-cert
  path exists), so gating these on route53_zone_ids was broken. Split
  Route53 into hosted-zone management (always) plus record-set mutation
  (scoped to caller-supplied zones, falls back to *).
- Remove unused cloudfront:* statement; no CloudFront resources in module.
- Replace acm:* wildcard with explicit cert-management action set.

Server module:
- qdrant_image_tag is now nullable with default null and validated against
  use_external_qdrant, so external-qdrant callers can omit it instead of
  passing a sentinel "unused" value.
- task_role_arn and efs_id outputs marked sensitive; qdrant_dns_name returns
  null when use_external_qdrant = true.
- ALB SG now has matching IPv6 egress rule (was v4-only).
- nextcloud_url validates the https:// scheme.
- random_pet.subdomain keeper includes zone_name so a zone migration that
  preserves zone_id still triggers regeneration.
- Pin required_version >= 1.9 on both modules.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

infra/terraform/nextcloud-mcp-deployer-role/vars.tf

@@ -60,9 +60,11 @@ variable "allow_secret_create" {
 
 variable "route53_zone_ids" {
   description = <<-EOT
-    Route53 hosted zone IDs the deployer is allowed to mutate. Only needed
-    in the module's custom-domain mode. Leave empty (the default) for the
-    CloudFront-default-cert path, which requires no DNS or ACM permissions.
+    Route53 public hosted zone IDs the deployer is allowed to mutate. The
+    server module always creates Route53 records (ALB alias + ACM DNS-01
+    validation), so this should be set to the zone(s) the module's
+    `zone_id` input points at. Leaving it empty falls back to `*` as a
+    convenience but is not recommended in production — scope it.
   EOT
   type        = list(string)
   default     = []