Implement project image upload functionality

[LaGodxy]

Description

This PR adds functionality to upload and manage project images, enabling projects to have multiple associated media assets stored in cloud storage.

Key Features:

• Integrated file upload support using @nestjs/platform-express and multer

• Added endpoint:

  • POST /projects/:id/images → Upload project images
  • DELETE /projects/:id/images/:imageId → Delete project images

• Implemented file validation:

  • Allowed formats: jpg, png, webp
  • Maximum file size: 5MB

• Uploaded images to cloud storage (S3/Supabase)

• Stored image URLs in the database

• Supported multiple images per project

This enhances project presentation and improves user engagement through visual content.

---

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Test addition/improvement

---

Checklist

• I have run npm run build successfully with no errors
• I have run npm test and all tests pass
• If I added new test files, they all pass
• My code follows the project's style guidelines
• I have performed a self-review of my code

---

CI/CD Requirements

The following checks will run automatically on this PR:

1. ✅ Build Check - Ensures the project builds successfully
2. ✅ Test Check - Ensures all tests pass (including any new test files)

---

Screenshots (if applicable)

N/A

closes #73

[drips-wave]

@LaGodxy Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits