feat(tests): add CreateProject, GetProject tests and GetAllProjects

[KothariMansi]

This PR adds comprehensive unit tests for the Project API endpoints:

1. GetAllProjects – verifies fetching all projects.
2. CreateProject – verifies creating a new project and persistence in the database.
3. GetProject – verifies fetching a single project by title, including the 404 case.
4. UpdateProject – verifies updating a project title and persisting changes.
5. DeleteProject – verifies deleting a project and confirming it is removed from the database.
6. ArchiveProject – verifies archiving a project and persisting the Archived state.
7. RestoreProject – verifies restoring an archived project and ensuring Archived is set to false.

All tests use an in-memory SQLite database and mux router to simulate API requests, ensuring fast and isolated unit testing without external dependencies.

This PR improves test coverage, reliability, and maintainability of the Project API.