[Aboyeji-Isaac]

Summary

Introduces a configurable feature-flag system to control the availability of selected application features.

Changes

• Provide a consistent mechanism for defining and evaluating feature flags.
• Support configuration through environment variables or the project's existing configuration system.
• Define predictable defaults for flags that are not explicitly configured.
• Integrate feature-flag evaluation where required by the issue.
• Add tests covering enabled, disabled, and default flag behavior.
• Document how to configure and use feature flags.

Testing

• Verify that enabled features behave as expected.
• Verify that disabled features remain unavailable through the relevant application paths.
• Run the project's linting, formatting, and test checks before merging.

Closes #249