Integrate frontend into ep-api repository

[rbardaji]

Description

Integrate the frontend (currently in national-data-platform/ep-frontend) into this repository, similar to how it's done in Federation API and Affinities projects.

Goals

• Unify frontend and backend in a single repository
• Simplify deployment with a single docker-compose
• Maintain current frontend functionality and design

Approach

• Incremental integration with small commits
• Test each component as it's added
• Fix issues (like auth requirements) during integration

Current Frontend

• Repository: national-data-platform/ep-frontend
• Version: 1.3.0-alpha
• Stack: React

Tasks

• Create /frontend directory structure
• Integrate React app incrementally
• Update docker-compose for unified deployment
• Test all functionality
• Update documentation