feat: Implement complete Book Search API

• Backend with Laravel and Docker
• MySQL database integration
• Book search functionality: GET /search?q=term
• Page retrieval: GET /page/{number}
• Docker containerization with nginx, app, database
• 698 pages imported from Eloquent JavaScript
• Complete Spanish documentation
• Environment configuration

Backend Focus

• Full-text search implementation
• REST API design
• Database modeling and migrations
• Containerized development environment
• Error handling and validation