Optimize player registration storage

[Samuel1-ona]

Use compact storage format for player registration data.

Acceptance Criteria:

• Reduce per-player storage footprint
• Use bit flags for boolean fields
• Pack registration timestamp efficiently
• Benchmark improvement

[theFirstCodeManiac]

@theFirstCodeManiac has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Maintainer please let me work on this for you immediately

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

[drips-wave]

Congratulations, @theFirstCodeManiac! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @theFirstCodeManiac: 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

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