unraid_api.php: track key_missing separately from general fallbacks.
vv_api_data() sets key_missing=true when HOST*_UNRAID_API_KEY is empty.
vv_api_get_status() includes key_missing in the status payload.
monitor.php: two distinct banner states instead of one orange warning.
key_missing → subtle dark/grey note: "API key not configured — add
HOST1_UNRAID_API_KEY in Scheduler → host conf to enable enhanced monitoring"
key present but unreachable → existing orange ⚠ with fallback list.
No banner at all when API is working correctly.