chore: rename mukke to music in infra, scripts, and CI/CD

Update remaining mukke references in root package.json scripts,
docker-compose files, Grafana dashboards, Prometheus config,
CD pipeline, cloudflared config, deploy scripts, load tests,
and mana-auth user-data service.

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

docker/grafana/dashboards/master-overview.json

@@ -482,8 +482,8 @@
 				},
 				{
 					"datasource": { "type": "prometheus", "uid": "${datasource}" },
-					"expr": "up{job=\"mukke-backend\"}",
-					"legendFormat": "Mukke",
+					"expr": "up{job=\"music-backend\"}",
+					"legendFormat": "Music",
 					"refId": "P"
 				},
 				{

docker/grafana/dashboards/system-overview.json

@@ -609,8 +609,8 @@
 				},
 				{
 					"datasource": { "type": "prometheus", "uid": "${datasource}" },
-					"expr": "up{job=\"mukke-backend\"}",
-					"legendFormat": "Mukke",
+					"expr": "up{job=\"music-backend\"}",
+					"legendFormat": "Music",
 					"refId": "P"
 				},
 				{

docker/prometheus/prometheus.yml

@@ -99,7 +99,7 @@ scrape_configs:
     scrape_interval: 30s
 
   # NOTE: Individual app backends (chat, todo, calendar, contacts, storage,
-  # nutriphi, mukke, planta, picture) have been REMOVED — all migrated to
+  # nutriphi, music, planta, picture) have been REMOVED — all migrated to
   # local-first architecture. Only uload-server and memoro-server remain.
 
   # Mana LLM Gateway (Ollama + Google Fallback)
@@ -246,7 +246,7 @@ scrape_configs:
           - https://mana.how/zitare
           - https://mana.how/cards
           - https://mana.how/skilltree
-          - https://mana.how/mukke
+          - https://mana.how/music
           - https://mana.how/citycorners
           - https://mana.how/memoro
           - https://mana.how/moodlit