Add comprehensive feature flag system

[ISTIFANUS-N]

Description

No feature flag system for controlled rollouts.

Acceptance Criteria

• Manage feature flags
• Support gradual rollout
• Enable A/B testing
• Add kill switches

[Ghoost-404]

@Ghoost-404 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

hello, i'd like to work on this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Ghoost-404 to this issue.

[drips-wave]

Congratulations, @Ghoost-404! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Ghoost-404: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊