…mands

Replace direct get_cloud_connection() calls with setup_cloud_environment()
and cleanup_cloud_environment() pattern in all manage commands. This ensures
proper cloud configuration by:
- Copying /etc/openstack/clouds.yaml to /tmp
- Loading passwords securely from vault via get_cloud_password()
- Creating /tmp/secure.yml with decrypted credentials
- Properly cleaning up temporary files after execution

Affected commands:
- manage loadbalancer list/reset/delete
- manage amphora restore/rotate
- manage volume list/repair
- manage server migrate/list/clean

Also adds --cloud parameter to ServerMigrate for consistency.

AI-assisted: Claude Code

Signed-off-by: Christian Berendt <berendt@osism.tech>