feat: implement Design Buddy AI interior design application

- Replace boilerplate with complete Design Buddy application
- Add AI-powered room design generation using Google Gemini SDK
- Implement user authentication with Google OAuth via Better Auth
- Create credit system with 30 free credits for new users
- Build image upload interface with drag-and-drop functionality
- Add room type and design style selection (Living Room, Kitchen, etc.)
- Implement AI generation with geographical restriction handling
- Add credit refund system for API failures
- Create responsive landing page with feature sections
- Replace all branding and navigation with Design Buddy theme
- Add complete user dashboard with real-time credit balance
- Implement download functionality for generated designs

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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