API: Complete Projects endpoints implementation

[diego-torres]

Overview

The studio requires full CRUD operations for projects to function properly.

Required Endpoints

• GET /projects - List projects with pagination
• POST /projects - Create new project
• GET /projects/{projectId} - Get project details
• PUT /projects/{projectId} - Update project
• DELETE /projects/{projectId} - Delete project

Studio Integration

The studio currently uses these endpoints in:

• src/features/projects/ProjectsPage.tsx
• src/features/projects/NewProjectModal.tsx

Acceptance Criteria

• All endpoints return proper HTTP status codes
• Proper error handling with ErrorResponse schema
• Authentication/authorization implemented
• Pagination support for list endpoint
• Validation using schemas from aurenworks-schemas

Priority

P0 - Critical for studio functionality