Enhance test coverage in the API project

[automagicallyio]

Description

Enhance test coverage across the Flask API project to ensure comprehensive testing of all endpoints, models, and utility functions. This will improve code reliability, catch bugs earlier, and make the codebase more maintainable.

Why This Matters

Strong test coverage is essential for maintaining code quality and preventing regressions. As the API grows, comprehensive tests provide confidence when making changes and help catch issues before they reach production. This is particularly important for a crowdfunding platform where data integrity and reliability are critical.

Acceptance Criteria

• Achieve minimum 80% code coverage for the server directory
• Add tests for all game API endpoints (GET, POST, PUT, DELETE)
• Add tests for all publisher API endpoints
• Ensure all SQLAlchemy models have comprehensive unit tests
• Test error handling and edge cases for all endpoints
• Add tests for database utility functions
• Generate and review coverage report
• Document any intentionally untested code with justification
• Update CI/CD pipeline to run tests and report coverage