Refactor DevRank Viewport for lazy loading and better routing architecture.

Tasks:

1. Create apps/devrank/view/home/MainContainer.mjs to encapsulate the Home view (Grid + Controls).
2. Update apps/devrank/view/Viewport.mjs:
   • Use lazy loading (module: () => import(...)) for Home and Learn views.
   • Remove activeIndex: 0 to allow the controller to handle routing.
3. Update apps/devrank/view/ViewportController.mjs:
   • Add defaultHash: '/home'.

Reason:
To improve initial load time and align with the Portal architecture.