[monitoring] Opt-out external monitor for family/mladost3/task-webhook/torrserver; drop r730

The `external-monitor-sync` script is opt-IN by default for any
*.viktorbarzin.me ingress, so a missing annotation means "monitored."
Both ingress factories previously OMITTED the annotation when
`external_monitor = false`, which silently left monitors in place.

Fix: when the caller sets `external_monitor = false` explicitly, emit
`uptime.viktorbarzin.me/external-monitor = "false"` so the sync script
deletes the monitor. Keep the previous behavior (no annotation) for
callers that leave external_monitor null — otherwise 19 publicly-reachable
services with `dns_type="none"` would lose monitoring.

Set external_monitor=false on family (grampsweb) and mladost3 (reverse-proxy)
to match the other two already-flagged services. Delete the r730 ingress
module entirely — the Dell server has been decommissioned.

stacks/grampsweb/main.tf

@@ -354,13 +354,14 @@ resource "kubernetes_service" "grampsweb" {
 }
 
 module "ingress" {
-  source          = "../../modules/kubernetes/ingress_factory"
-  namespace       = kubernetes_namespace.grampsweb.metadata[0].name
-  name            = "family"
-  service_name    = "grampsweb"
-  tls_secret_name = var.tls_secret_name
-  max_body_size   = "500m"
-  protected       = true
+  source           = "../../modules/kubernetes/ingress_factory"
+  namespace        = kubernetes_namespace.grampsweb.metadata[0].name
+  name             = "family"
+  service_name     = "grampsweb"
+  tls_secret_name  = var.tls_secret_name
+  max_body_size    = "500m"
+  protected        = true
+  external_monitor = false
   extra_annotations = {
     "gethomepage.dev/enabled"      = "true"
     "gethomepage.dev/name"         = "GrampsWeb"