Backend feat

[AffableMelon]

This pull request introduces the backend implementation for a classroom reservation system.

Core Application and API Endpoints:

• Implemented the main app.js file to configure middleware, routes, and error handling for the Express application.
• modular route controllers for:
  • User management (backend/controllers/users.js): Includes endpoints for retrieving, creating, and managing users.
  • Classroom management (backend/controllers/classrooms.js): Includes endpoints for fetching and creating classrooms.
  • Reservation management (backend/controllers/reservations.js): Includes endpoints for creating, updating, deleting, and fetching reservations with conflict checks.
  • Authentication (backend/controllers/login.js and backend/controllers/signup.js): Includes login and signup functionality with JWT-based authentication. [1] [2]

Database Schema and Migrations:

• Created initial Prisma migration (backend/prisma/migrations/20250424152853_init/migration.sql) to define tables for users, buildings, floors, classrooms, and reservations, along with relationships and constraints.

Documentation and Startup:

• Updated backend/README.md with instructions for setting up and running the backend, including database migrations and seeding.
• Added backend/index.js to start the Express server on the configured port.