revert(infra): use standard Docker volume for MinIO

SSD bind mount requires Docker Desktop GUI configuration for
/Volumes access. Reverting to standard volume until manually configured.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.macmini.yml

@@ -59,7 +59,7 @@ services:
       MINIO_ROOT_USER: ${MINIO_ACCESS_KEY:-minioadmin}
       MINIO_ROOT_PASSWORD: ${MINIO_SECRET_KEY:-minioadmin}
     volumes:
-      - /Volumes/TillJakob-S04/ManaData/minio:/data
+      - minio_data:/data
     ports:
       - "9000:9000"
       - "9001:9001"
@@ -1288,6 +1288,8 @@ volumes:
     name: mana-postgres-data
   redis_data:
     name: mana-redis-data
+  minio_data:
+    name: mana-minio-data
   victoriametrics_data:
     name: mana-victoria-data
   grafana_data: