Hub v0.6.0: Geo-restriction display + disable button + UUID cleanup

- Add geo-restriction section to customer detail page (status, countries,
  per-app overrides, sync state, errors)
- Add "Összes geo-korlátozás eltávolítása" button that directly calls
  Cloudflare API to delete [felhom-geo] WAF rules (bypasses blocked tunnel)
- Background retry to notify controller to disable geo in settings
- New internal/cloudflare/unblock.go — minimal CF client for rule deletion
- Remove legacy Monitoring UUIDs from config form, buildConfigJSON,
  handlePullConfig, volatileKeys, and controller.yaml.default

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hub/internal/web/controller.yaml.default

@@ -80,12 +80,6 @@ backup:
 monitoring:
   enabled: true
   healthchecks_base: "https://status.felhom.eu"
-  # ping_uuids: (deprecated — monitoring is now handled by the Hub event system)
-  #   heartbeat: ""
-  #   system_health: ""
-  #   db_dump: ""
-  #   backup: ""
-  #   backup_integrity: ""
   system_health_interval: "5m"
   health_check_schedule: "06:00"
   thresholds: