- Implement `BuildingEditorModal.svelte` for creating, editing, and deleting buildings and floors.
- Add `CreateBuildingDto`, `UpdateBuildingDto`, `CreateFloorDto`, and `UpdateFloorDto` for validation.
- Extend `SpacesService` and `SpacesController` with endpoints for building and floor CRUD operations.
- Update Prisma schema to include building descriptions and image URLs, and floor names.
- Enhance dashboard with building management functionality for admin users.