feat: add the dislike functionality

[victormayowa]

Pull Request

Description

This PR adds the dislike functionality to the application. Users can now dislike posts/comments, and their preferences are stored in the database. This feature complements the existing like functionality and allows users to express disapproval on content.

Related Issue

Feature #(1274)

Type of Change

• feat: New feature (add the dislike functionality)

How Has This Been Tested?

• Unit tests
• Integration tests
• Manual tests

Test Evidence

Screenshots (if applicable)

Documentation Screenshots (if applicable)

Checklist

• My code follows the project's coding style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published
• I have included a screenshot showing all tests passing
• I have included documentation screenshots (if applicable)

Additional Notes

• API endpoint: POST /api/v1/posts/:id/dislike