Remove legacy scripts and single-tenant support

- Deleted the migration script `migrate-to-multitenant.sh` as it is no longer needed.
- Removed `rebuild-venv.sh`, `restore.sh`, `run-backup.sh`, and other related scripts that are not compatible with the new multi-tenant architecture.
- Updated `restart.sh`, `start.sh`, `stop.sh`, `update.sh`, and other scripts to eliminate references to single-tenant deployment, ensuring they only support multi-tenant configurations.

Co-authored-by: Copilot <copilot@github.com>

docker-compose-multitenant.yml

@@ -99,6 +99,7 @@ services:
       INVENTAR_REDIS_HOST: redis
       INVENTAR_REDIS_PORT: "6379"
       INVENTAR_REDIS_DB: "0"
+      INVENTAR_TENANT_PORT_MAP: "${INVENTAR_TENANT_PORT_MAP:-}"
       
       # Storage Configuration
       INVENTAR_BACKUP_FOLDER: /data/backups