feat: add Music licensing challenge example with Nextjs

[alecastro-nan]

What's this PR do?

This PR introduces a music licensing UI for managing movies, scenes, tracks, and song license statuses.
It leverages Next.js 15 (App Router), Apollo Client for GraphQL queries/mutations/subscriptions, TailwindCSS 4 for styling, and BiomeJS for linting/formatting.

Summary of changes in this PR:

• Adds a responsive UI for browsing movies, scenes, and tracks.
• Allows editing and viewing of song license statuses.
• Implements real-time updates for license status changes using GraphQL subscriptions.
• Integrates authentication (login/register) flows.
• Uses custom hooks for live data (e.g., useSongWithLiveStatus).
• Applies consistent styling with TailwindCSS 4.
• Ensures code quality with BiomeJS linting and formatting.

@ulises-jeremias @rpmolina

Summary by CodeRabbit

• New Features
  • Introduced a full-featured Music Licensing App example with authentication, movies, scenes, tracks, and song license management.
  • Added real-time license status updates, search functionality, and responsive navigation with protected routes.
  • Implemented user login, logout, and registration pages with error handling and session management.
  • Integrated GraphQL queries, mutations, and subscriptions for dynamic data interaction.
  • Included interactive UI components such as dropdowns, buttons, and detailed movie/scene/song views.
• Documentation
  • Added comprehensive README with setup instructions, tech stack details, and contribution guidelines.
  • Provided example environment variable file for easy configuration.
• Style
  • Enabled Tailwind CSS for consistent and modern UI styling.
• Chores
  • Added configuration files for TypeScript, Biome, PostCSS, and project dependencies.
  • Set up Husky hooks for linting, formatting, and type-checking before commits and pushes.