refactor(tests): replace crud references with repo across repository test files

- Updated import statements and test logic to align with `repositories` naming changes.
- Adjusted documentation and test names for consistency with the updated naming convention.
- Improved test descriptions to reflect the repository-based structure.

CONTRIBUTING.md

@@ -204,7 +204,7 @@ export function UserProfile({ userId }: UserProfileProps) {
 
 ### Key Patterns
 
-- **Backend**: Use CRUD pattern, keep routes thin, business logic in services
+- **Backend**: Use repository pattern, keep routes thin, business logic in services
 - **Frontend**: Use React Query for server state, Zustand for client state
 - **Both**: Handle errors gracefully, log appropriately, write tests