Implement API versioning with deprecation policy

[RUKAYAT-CODER]

Formal API versioning and deprecation.

Acceptance Criteria:

• Version header support
• Deprecation notices
• Migration guides
• End-of-life policy

[Essence-3]

@Essence-3 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I would love to work on this issue and I have a solution for this already.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Essence-3 to this issue.

[Jess52487]

@Jess52487 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Good day boss, i'm eagere to work on this issue and contribute effective result.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Jess52487 to this issue.

[drips-wave]

Congratulations, @Essence-3! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Essence-3: 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 🌊