Fixed

- Fixed `/auction reload` subcommand to properly reload configuration without requiring a full server restart.

Added

- Added new `/order` command to open the menu for placing an order.
- Added new `/orders` command to open the orders GUI directly.
- Added new standalone order GUIs for better user interaction.
- Improved debug mode for order features, providing more detailed logging and diagnostics.
- Added new `orders-only.yml` configuration file with `orders-only-mode: false` option. When set to `true`, it enables only the Orders feature and `/orders` command, disabling most other auction features. Changes take effect after a reload.

Changed

- Refactored plugin loading structure for better modularity and maintainability, including updates to `PluginRegistry.java` for staged initialization and component-based setup.