chore(infra): drop status-page-gen from Mini, status.mana.how → GPU-Box tunnel

Phase 2e cleanup. status-page-gen + a dedicated nginx now run on the
GPU-Box (sparse repo clone provides the generator script + mana-apps.ts,
hourly git-pull via systemd timer). Container queries VictoriaMetrics
locally over docker-network ('http://victoriametrics:9090'), no public
vm.mana.how endpoint required — that hostname is also gone from the
GPU tunnel config (v25 → v26 effectively, removed in same PUT that
added status.mana.how).

DNS for status.mana.how now points at the mana-gpu-server tunnel.
Mini-tunnel ingress for it is removed; the previous 'mana-status-gen'
container on the Mini was stopped + rm'd.

Side benefit: closes the inode-stale-bind-mount bug that took status.
mana.how down for a few hours — single-file bind mounts on the Mini
break whenever the CD git-checkout rewrites the source file. The
GPU-Box mounts the same files but the systemd timer git-pulls in-
place, preserving the inode.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cloudflared-config.yml

@@ -193,8 +193,6 @@ ingress:
   # ============================================
   # Self-hosted landing pages (Nginx on port 4400)
   # ============================================
-  - hostname: status.mana.how
-    service: http://localhost:4400
   - hostname: it.mana.how
     service: http://localhost:4400
   - hostname: chats.mana.how