feat: T001 backend documentation and T002 NestJS project setup

[zainrikaz21-prog]

Summary

This PR covers the completion of T001 and T002 for the backend team.

T002 — Backend Project Initialisation

• Initialised NestJS project inside the monorepo under /backend
• Installed all necessary packages:
  • @nestjs/prisma, prisma, pg (database)
  • @nestjs/jwt, @nestjs/passport, passport-jwt (authentication)
  • bcryptjs, cookie-parser (security)
  • @nestjs/config, class-validator, class-transformer (validation)
• Confirmed server runs successfully on http://localhost:3000

T001 — Backend Framework Documentation

• Created docs/BACKEND.md under the /docs directory
• Documentation covers:
  • Technology stack with reasons
  • Why NestJS over Express
  • Layered architecture explanation
  • Row Version concept
  • Authentication flow with HTTP-only cookies
  • API conventions and pagination
  • Environment variables
  • How to set up and run
  • Git workflow and branch naming

Notes

• Prisma selected as ORM instead of TypeORM
• Monorepo structure confirmed — backend lives under /backend
• Branch naming follows feature/- convention

Checklist

• Project initialised and running
• All packages installed
• Documentation written and saved to /docs/BACKEND.md
• Tested server runs successfully