Add frontend development documentation and convenience scripts

[Copilot]

Adds documentation and tooling for running backend (port 5280) and Next.js frontend (port 3000) concurrently during local development.

Changes

• README.md: New Frontend section with Node 18+ prerequisites, installation (cd src/frontend && npm install), and instructions for running both services via two terminal sessions or Makefile

• Makefile: Convenience targets for running services independently or concurrently:

  make dev           # Both services with -j2
  make dev-backend   # dotnet run --project src/MythApi.csproj
  make dev-frontend  # cd src/frontend && npm run dev

Frontend assumes backend at http://localhost:5280 for API calls.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add Dev Scripts and Documentation</issue_title>
<issue_description># Step 9: Add Dev Scripts and Documentation

Description

Make it easy for developers to run both the backend and frontend during local development. Update the project README with instructions for the new frontend.

Implementation Steps

1. Update root README.md — Add a "Frontend" section covering:

   • Prerequisites: Node.js 18+, npm.
   • How to install dependencies: cd src/frontend && npm install.
   • How to run the dev server: cd src/frontend && npm run dev.
   • The frontend URL: http://localhost:3000.
   • The expected backend URL: http://localhost:5280.
   • How to run both services simultaneously (two terminal sessions).

2. Add a convenience script (optional) — Consider adding a root-level Makefile or package.json with scripts to run both services:

   dev-backend:
   	dotnet run --project src/MythApi.csproj
   
   dev-frontend:
   	cd src/frontend && npm run dev
   
   dev:
   	make -j2 dev-backend dev-frontend

3. Update src/frontend/package.json — Verify the dev script runs on port 3000 (default). If a custom port is needed, update it:

   "dev": "next dev -p 3000"

Files Modified

• README.md

Files Optionally Created

• Makefile (or root package.json)

Acceptance Criteria

• A new developer can clone the repo and get both services running by following the README.
• The frontend dev server starts on port 3000.
• The backend API is accessible from the frontend without CORS errors.
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add Dev Scripts and Documentation #11

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