Sneha/feature/user project roles api

[snehagopalappa]

Summary:

Implements the User Project Role API module with full CRUD endpoints, role-based access control, validation, and tests.

Changes

New module src/modules/user-project-roles/

• userProjectRole.service.ts — business logic with full validation, 404/409 guards and Prisma error handling
• userProjectRole.controller.ts — thin request/response layer delegating to service
• userProjectRole.routes.ts — 3 endpoints with full Swagger documentation and role-based access control
• index.ts — exports the router

src/routes/index.ts

• Registered new routes under /user-project-roles

tests/unit/userProjectRole.test.ts
-12 unit tests covering all service methods including success cases, 400/404/409 error cases and database error handling

tests/integration/userProjectRole.test.ts

• 22 integration tests covering all 3 endpoints with full RBAC, validation and error case coverage

Endpoints

• GET /user-project-roles — ADMIN and MANAGER only
• POST /user-project-roles — ADMIN only
• DELETE /user-project-roles/:user_id/:project_id/:role_id — ADMIN only

Test Results

• 12 unit tests — all passing
• 22 integration tests — all passing
• Type-check and lint passing with zero errors

Notes

• Depends on sneha/feature/user-project-roles schema PR feat: Add user_project_roles schema #43 (already merged)
• ERD diagram update pending