truenas deprecation: migrate all non-immich storage to proxmox NFS

- Migrate 7 backup CronJobs to Proxmox host NFS (192.168.1.127)
  (etcd, mysql, postgresql, nextcloud, redis, vaultwarden, plotting-book)
- Migrate headscale backup, ebook2audiobook, osm_routing to Proxmox NFS
- Migrate servarr (lidarr, readarr, soulseek) NFS refs to Proxmox
- Remove 79 orphaned TrueNAS NFS module declarations from 49 stacks
- Delete stacks/platform/modules/ (27 dead module copies, 65MB)
- Update nfs-truenas StorageClass to point to Proxmox (192.168.1.127)
- Remove iscsi DNS record from config.tfvars
- Fix woodpecker persistence config and alertmanager PV

Only Immich (8 PVCs, ~1.4TB) remains on TrueNAS.

stacks/mailserver/modules/mailserver/main.tf

@@ -167,14 +167,6 @@ resource "kubernetes_secret" "opendkim_key" {
 }
 
 
-module "nfs_data" {
-  source     = "../../../../modules/kubernetes/nfs_volume"
-  name       = "mailserver-data"
-  namespace  = kubernetes_namespace.mailserver.metadata[0].name
-  nfs_server = var.nfs_server
-  nfs_path   = "/mnt/main/mailserver"
-}
-
 resource "kubernetes_persistent_volume_claim" "data_proxmox" {
   wait_until_bound = false
   metadata {
@@ -534,6 +526,13 @@ resource "kubernetes_service" "mailserver" {
       port        = 993
       target_port = "imap-secure"
     }
+
+    port {
+      name        = "dovecot-metrics"
+      protocol    = "TCP"
+      port        = 9166
+      target_port = 9166
+    }
   }
 }
 
@@ -550,7 +549,7 @@ resource "kubernetes_cron_job_v1" "email_roundtrip_monitor" {
     concurrency_policy            = "Replace"
     failed_jobs_history_limit     = 3
     successful_jobs_history_limit = 3
-    schedule                      = "*/30 * * * *"
+    schedule                      = "*/10 * * * *"
     job_template {
       metadata {}
       spec {

stacks/mailserver/modules/mailserver/roundcubemail.tf

@@ -4,22 +4,6 @@ variable "roundcube_db_password" {
 }
 variable "mysql_host" { type = string }
 
-module "nfs_roundcube_html" {
-  source     = "../../../../modules/kubernetes/nfs_volume"
-  name       = "roundcubemail-html"
-  namespace  = kubernetes_namespace.mailserver.metadata[0].name
-  nfs_server = var.nfs_server
-  nfs_path   = "/mnt/main/roundcubemail/html"
-}
-
-module "nfs_roundcube_enigma" {
-  source     = "../../../../modules/kubernetes/nfs_volume"
-  name       = "roundcubemail-enigma"
-  namespace  = kubernetes_namespace.mailserver.metadata[0].name
-  nfs_server = var.nfs_server
-  nfs_path   = "/mnt/main/roundcubemail/enigma"
-}
-
 resource "kubernetes_config_map" "roundcubemail_config" {
   metadata {
     name      = "roundcubemail.config"