feat(marketplace): Add Crawl4AI marketplace with secure configuration

- Implement marketplace frontend and admin dashboard
- Add FastAPI backend with environment-based configuration
- Use .env file for secrets management
- Include data generation scripts
- Add proper CORS configuration
- Remove hardcoded password from admin login
- Update gitignore for security

docs/md_v2/marketplace/README.md

@@ -0,0 +1,66 @@
+# Crawl4AI Marketplace
+
+A terminal-themed marketplace for tools, integrations, and resources related to Crawl4AI.
+
+## Setup
+
+### Backend
+
+1. Install dependencies:
+```bash
+cd backend
+pip install -r requirements.txt
+```
+
+2. Generate dummy data:
+```bash
+python dummy_data.py
+```
+
+3. Run the server:
+```bash
+python server.py
+```
+
+The API will be available at http://localhost:8100
+
+### Frontend
+
+1. Open `frontend/index.html` in your browser
+2. Or serve via MkDocs as part of the documentation site
+
+## Database Schema
+
+The marketplace uses SQLite with automatic migration from `schema.yaml`. Tables include:
+- **apps**: Tools and integrations
+- **articles**: Reviews, tutorials, and news
+- **categories**: App categories
+- **sponsors**: Sponsored content
+
+## API Endpoints
+
+- `GET /api/apps` - List apps with filters
+- `GET /api/articles` - List articles
+- `GET /api/categories` - Get all categories
+- `GET /api/sponsors` - Get active sponsors
+- `GET /api/search?q=query` - Search across content
+- `GET /api/stats` - Marketplace statistics
+
+## Features
+
+- **Smart caching**: LocalStorage with TTL (1 hour)
+- **Terminal theme**: Consistent with Crawl4AI branding
+- **Responsive design**: Works on all devices
+- **Fast search**: Debounced with 300ms delay
+- **CORS protected**: Only crawl4ai.com and localhost
+
+## Admin Panel
+
+Coming soon - for now, edit the database directly or modify `dummy_data.py`
+
+## Deployment
+
+For production deployment on EC2:
+1. Update `API_BASE` in `marketplace.js` to production URL
+2. Run FastAPI with proper production settings (use gunicorn/uvicorn)
+3. Set up nginx proxy if needed