🐳 chore(docker-compose.yml): update volume names for consistency and clarity

- Rename volume `./pgadmin` to `pgadmin-data` for better naming convention and clarity.
- Rename volumes for RabbitMQ:
  - `./.docker/rabbitmq/etc/` to `rabbitmq_data` for consistency and clarity.
  - `./.docker/rabbitmq/data/` to `rabbitmq_data` for consistency and clarity.
  - `./.docker/rabbitmq/logs/` to `rabbitmq_log` for consistency and clarity.

No functional changes, only volume name updates.