deprecate TrueNAS: migrate Immich NFS to Proxmox, remove all 10.0.10.15 references [ci skip]

- Migrate Immich (8 NFS PVs, 1.1TB) from TrueNAS to Proxmox host NFS
- Update config.tfvars nfs_server to 192.168.1.127 (Proxmox)
- Update nfs-csi StorageClass share to /srv/nfs
- Update scripts (weekly-backup, cluster-healthcheck) to Proxmox IP
- Delete obsolete TrueNAS scripts (nfs_exports.sh, truenas-status.sh)
- Rewrite nfs-health.sh for Proxmox NFS monitoring
- Update Freedify nfs_music_server default to Proxmox
- Mark CloudSync monitor CronJob as deprecated
- Update Prometheus alert summaries
- Update all architecture docs, AGENTS.md, and reference docs
- Zero PVs remain on TrueNAS — VM ready for decommission

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/cluster_healthcheck.sh

@@ -938,15 +938,15 @@ check_kyverno() {
 check_nfs() {
     section 20 "NFS Connectivity"
 
-    if showmount -e 10.0.10.15 &>/dev/null; then
-        pass "NFS server 10.0.10.15 reachable (exports listed)"
+    if showmount -e 192.168.1.127 &>/dev/null; then
+        pass "NFS server 192.168.1.127 (Proxmox) reachable (exports listed)"
         json_add "nfs" "PASS" "NFS reachable"
-    elif nc -z -G 3 10.0.10.15 2049 &>/dev/null; then
-        pass "NFS server 10.0.10.15 port 2049 open"
+    elif nc -z -G 3 192.168.1.127 2049 &>/dev/null; then
+        pass "NFS server 192.168.1.127 port 2049 open"
         json_add "nfs" "PASS" "NFS port open"
     else
         [[ "$QUIET" == true ]] && section_always 20 "NFS Connectivity"
-        fail "NFS server 10.0.10.15 unreachable — 30+ services depend on NFS"
+        fail "NFS server 192.168.1.127 (Proxmox) unreachable — 30+ services depend on NFS"
         json_add "nfs" "FAIL" "NFS unreachable"
     fi
 }