Refactor Site Builder Integration and Update Docker Configuration

- Merged the site builder functionality into the main app, enhancing the SiteBuilderWizard component with new steps and improved UI.
- Updated the Docker Compose configuration by removing the separate site builder service and integrating its functionality into the igny8_sites service.
- Enhanced Vite configuration to support code-splitting for builder routes, optimizing loading times.
- Updated package dependencies to include new libraries for state management and form handling.

sites/MIGRATION_SUMMARY.md

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+# Site Builder → Sites Container Migration Summary
+
+## Overview
+Successfully merged Site Builder container into Sites container. Sites is now the primary container hosting both:
+- **Public Site Renderer** (no auth required)
+- **Site Builder** (auth required)
+
+## Structure Changes
+
+### New Directory Structure
+```
+sites/src/
+├── builder/              # Site Builder (from site-builder/src/)
+│   ├── pages/           # Wizard, Preview, Dashboard
+│   ├── components/      # Builder-specific components
+│   ├── state/           # Zustand stores
+│   ├── api/             # API client with conditional auth
+│   ├── types/           # TypeScript types
+│   └── App.css          # Builder styles
+├── renderer/            # Sites Renderer (existing)
+│   ├── pages/           # SiteRenderer component
+│   ├── loaders/         # Site definition loaders
+│   ├── utils/           # Layout renderer utilities
+│   └── types/           # Renderer types
+├── shared/              # Shared components
+│   └── ProtectedRoute.tsx
+├── App.tsx              # Unified router
+└── main.tsx             # Entry point
+```
+
+## Routing Structure
+
+### Public Routes (No Auth)
+- `/:siteId/*` - Site renderer (public sites)
+- `/` - Root page
+
+### Builder Routes (Auth Required)
+- `/builder` - Wizard page
+- `/builder/preview` - Preview canvas
+- `/builder/dashboard` - Blueprint history
+
+## Key Changes
+
+### 1. Unified Router (`App.tsx`)
+- Single router handles both builder and renderer routes
+- Builder routes wrapped in `ProtectedRoute` component
+- Builder routes wrapped in `BuilderLayout` component
+- Code-splitting for builder routes (lazy loading)
+
+### 2. Authentication
+- `ProtectedRoute` component checks for JWT token in localStorage
+- Builder API client conditionally includes auth headers
+- Public renderer routes have no authentication
+
+### 3. API Clients
+- Builder API (`builder/api/builder.api.ts`): Includes auth token if available
+- Renderer API (`renderer/loaders/loadSiteDefinition.ts`): No auth required
+
+### 4. Build Configuration
+- Updated `vite.config.ts` with code-splitting
+- Builder routes split into separate chunk
+- Supports both `sites.igny8.com` and `builder.igny8.com` domains
+
+### 5. Docker Configuration
+- Removed `igny8_site_builder` service from docker-compose
+- Updated `igny8_sites` service comment
+- Single container now handles both functions
+
+## Backend (No Changes)
+- Backend Django views remain unchanged
+- API endpoints: `/api/v1/site-builder/` (same as before)
+- Database tables: No changes
+- Authentication: Same JWT-based auth
+
+## Migration Checklist
+
+✅ Created merged directory structure
+✅ Moved site-builder files to sites/src/builder/
+✅ Created unified App.tsx with routing
+✅ Created ProtectedRoute component
+✅ Created BuilderLayout component
+✅ Merged package.json dependencies
+✅ Updated vite.config.ts with code-splitting
+✅ Updated main.tsx entry point
+✅ Updated docker-compose.app.yml (removed site_builder service)
+✅ Updated API clients with conditional authentication
+✅ Updated index.css with builder styles
+
+## Next Steps
+
+1. **Test Builder Functionality**
+   - Navigate to `/builder` (should require auth)
+   - Test wizard flow
+   - Test preview
+   - Test dashboard
+
+2. **Test Renderer Functionality**
+   - Navigate to `/:siteId/*` (should work without auth)
+   - Test site loading from filesystem
+   - Test site loading from API
+
+3. **Build & Deploy**
+   - Build Docker image: `docker build -t igny8-sites-dev:latest -f Dockerfile.dev .`
+   - Update docker-compose: `docker compose -f docker-compose.app.yml up -d igny8_sites`
+
+4. **Cleanup** (Optional)
+   - Remove `/site-builder` directory after verification
+   - Update documentation
+
+## Notes
+
+- **No Backward Compatibility**: Old site-builder container is removed
+- **Backend Unchanged**: All Django views and models remain the same
+- **Code-Splitting**: Builder code is lazy-loaded, so public sites don't load builder code
+- **Route Conflicts**: Builder routes are namespaced under `/builder/*` to avoid conflicts
+