Adds a new scaffolding command, `/core:scaffold`, to generate boilerplate code for models, actions, controllers, and modules.
The command includes subcommands for each component:
- `/core:scaffold model <name>`
- `/core:scaffold action <name>`
- `/core:scaffold controller <name>`
- `/core:scaffold module <name>`
The templates follow the conventions of the Host UK monorepo and include necessary boilerplate code, namespaces, and directory structures. A placeholder test file is also included.
