chore(fleet): repoint stale irv-ml1 refs (10.100.79.3 -> irv-ml1.nh3.internal)

The 2026-09-06 headscale cutover retired irv-ml1's wg0 tunnel IP 10.100.79.3
(now 10.6.110.50). Repointed all LIVE canonical refs to the DNS NAME so the next
move can't re-break them: homepage.href/siteMonitor labels across 25 stack
composes, load-bearing env defaults (asset-engine INFERENCE_HOST, open-webui
AUDIO_TTS_OPENAI_API_BASE_URL, skaldsong SKALDSONG_TTS_BASE_URL, zonos-gateway
ZONOS_URL, dia), homepage services.yaml manual cards (Voice Design Studio,
IRV-ML1), and servers/irv-ml1/ssh-target. Updated the stale 'WG tunnel' comment
to the mesh reality.

Left as-is: README curl-examples and .env.example comments (docs), and historical
mentions in CLAUDE.md/persistent-memory. NOTE: applying the label repoints to the
RUNNING irv-ml1 containers needs a recreate per service (labels read at creation);
deployed .env values are separate from these canonical defaults.

stacks/homepage/conf/services.yaml

@@ -61,9 +61,9 @@
   # with the other studios rather than in Apps: it is a workspace you open and
   # produce something in, which is exactly what that group is for.
   - Voice Design Studio:
-      href: http://10.100.79.3:8216/
+      href: http://irv-ml1.nh3.internal:8216/
       icon: mdi-microphone
-      siteMonitor: http://10.100.79.3:8216/health
+      siteMonitor: http://irv-ml1.nh3.internal:8216/health
       description: Mint, audition and keeper-mark synthetic fleet voices — irv-ml1, CPU-only
 
 - Media:
@@ -178,17 +178,17 @@
       description: Proxmox Backup Server — DR mirror (pulls from PBS-ANA)
 
 - Infra - IRV:
-  # Irvine site — reachable only via WireGuard tunnel from NH3.
-  # The 10.100.79.0/24 subnet is the WG tunnel IP space; these cards
-  # only light up when the WG link is healthy.
+  # Irvine site — irv-ml1 folded into the headscale mesh 2026-09-06; the
+  # old 10.100.79.0/24 WG tunnel space is dormant. These cards resolve via
+  # irv-ml1.nh3.internal (-> 10.6.110.50) and light up over the mesh.
   - IRV-ML1:
-      ping: 10.100.79.3
+      ping: irv-ml1.nh3.internal
       icon: mdi-brain
       description: GPU host (bare-metal, RTX 3090 + RTX A6000, native AI stacks)
   - IRV-ML1-Dockge:
-      href: http://10.100.79.3:5001
+      href: http://irv-ml1.nh3.internal:5001
       icon: si-docker
-      siteMonitor: http://10.100.79.3:5001
+      siteMonitor: http://irv-ml1.nh3.internal:5001
       description: Docker management (irv-ml1)
 
 - Infra - ESH: