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>

package.json

@@ -18,6 +18,7 @@
   "dependencies": {
     "@ai-sdk/openai": "^2.0.9",
     "@ai-sdk/react": "^2.0.9",
+    "@google/genai": "^1.19.0",
     "@radix-ui/react-avatar": "^1.1.10",
     "@radix-ui/react-dialog": "^1.1.14",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
@@ -28,6 +29,7 @@
     "clsx": "^2.1.1",
     "drizzle-orm": "^0.44.4",
     "lucide-react": "^0.539.0",
+    "mime": "^4.1.0",
     "next": "15.4.6",
     "next-themes": "^0.4.6",
     "pg": "^8.16.3",
@@ -36,6 +38,7 @@
     "react-dom": "19.1.0",
     "react-markdown": "^10.1.0",
     "tailwind-merge": "^3.3.1",
+    "uuid": "^13.0.0",
     "zod": "^4.0.17"
   },
   "devDependencies": {
@@ -45,6 +48,7 @@
     "@types/pg": "^8.15.5",
     "@types/react": "^19",
     "@types/react-dom": "^19",
+    "@types/uuid": "^10.0.0",
     "drizzle-kit": "^0.31.4",
     "eslint": "^9",
     "eslint-config-next": "15.4.6",