Refactor Site Builder Integration and Update Component Structure

- Removed the separate `igny8_sites` service from Docker Compose, integrating its functionality into the main app.
- Updated the Site Builder components to enhance user experience, including improved loading states and error handling.
- Refactored routing and navigation in the Site Builder Wizard and Preview components for better clarity and usability.
- Adjusted test files to reflect changes in import paths and ensure compatibility with the new structure.

SITE_BUILDER_INTEGRATION_PLAN.md

@@ -125,21 +125,21 @@ Integrate the Site Builder wizard directly into the main frontend app (`frontend
 1. Copy `siteDefinitionStore.ts` from `sites/src/builder/state/`
 2. Use for preview functionality (if needed)
 
-### Phase 7: Update Routing & Navigation ⏳
+### Phase 7: Update Routing & Navigation ✅
 **Location**: `frontend/src/App.tsx`
 
 **Tasks**:
 1. Ensure `/sites/builder` route points to new `Wizard.tsx`
 2. Update navigation to show wizard in Sites section
 
-### Phase 8: Fix Test File ⏳
+### Phase 8: Fix Test File ✅
 **Location**: `frontend/src/__tests__/sites/BulkGeneration.test.tsx`
 
 **Tasks**:
 1. Update import path from `site-builder/src/api/builder.api` to `services/siteBuilder.api`
 2. Update mock path accordingly
 
-### Phase 9: Testing ⏳
+### Phase 9: Testing ⏳ *(blocked by vitest not installed in dev env)*
 **Tasks**:
 1. Test wizard flow:
    - Site selection