storage: migrate send off proxmox-lvm to NFS (LUN-cap relief)

Send (timvisee/send) stores encrypted upload blobs on disk with metadata in
Redis — no embedded DB, NFS-safe. Frees one proxmox-csi SCSI-LUN slot on node2.

- swap send-data-proxmox -> nfs_volume module
- blobs copied + verified (273M, 22 entries, HTTP 200 on NFS)
- block PVC removed; LV retained per SC policy (code-dfjn cleanup)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

stacks/send/main.tf

@@ -27,33 +27,16 @@ module "tls_secret" {
   tls_secret_name = var.tls_secret_name
 }
 
-resource "kubernetes_persistent_volume_claim" "data_proxmox" {
-  wait_until_bound = false
-  metadata {
-    name      = "send-data-proxmox"
-    namespace = kubernetes_namespace.send.metadata[0].name
-    annotations = {
-      "resize.topolvm.io/threshold"     = "10%"
-      "resize.topolvm.io/increase"      = "100%"
-      "resize.topolvm.io/storage_limit" = "5Gi"
-    }
-  }
-  spec {
-    access_modes       = ["ReadWriteOnce"]
-    storage_class_name = "proxmox-lvm"
-    resources {
-      requests = {
-        storage = "1Gi"
-      }
-    }
-  }
-  lifecycle {
-    # The autoresizer expands requests.storage up to storage_limit and
-    # PVCs can't shrink. Without this, every TF apply tries to revert
-    # to the spec value, K8s rejects the shrink, and the PVC ends up
-    # in Terminating-but-in-use limbo.
-    ignore_changes = [spec[0].resources[0].requests]
-  }
+# Upload blobs on NFS. Migrated off proxmox-lvm 2026-06-05 for LUN-cap relief —
+# Send stores encrypted file blobs on disk (metadata in Redis), no embedded DB,
+# NFS-safe. See docs/plans/2026-06-05-block-storage-harden-nfs-design.md
+module "nfs_send" {
+  source     = "../../modules/kubernetes/nfs_volume"
+  name       = "send-data-nfs"
+  namespace  = kubernetes_namespace.send.metadata[0].name
+  nfs_server = var.nfs_server
+  nfs_path   = "/srv/nfs/send"
+  storage    = "5Gi"
 }
 
 resource "kubernetes_deployment" "send" {
@@ -142,7 +125,7 @@ resource "kubernetes_deployment" "send" {
         volume {
           name = "data"
           persistent_volume_claim {
-            claim_name = kubernetes_persistent_volume_claim.data_proxmox.metadata[0].name
+            claim_name = module.nfs_send.claim_name
           }
         }
       }