Add Quest Participant Limit

[Mkalbani]

Introduces controlled participation mechanics useful for limited-access quests.

Acceptance Criteria

• Quest creator can define maximum participants.
• Joining should revert once limit is reached.
• Participant count should remain accurate under all conditions.

[gerani1]

@gerani1 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hello, working on this will be fast, can i get assigned

ℹ️ Repo Maintainers: To accept this application, review their application or assign @gerani1 to this issue.

[ZuLu0890]

@ZuLu0890 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would love to work on this issue boss

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ZuLu0890 to this issue.

[drips-wave]

Congratulations, @ZuLu0890! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @ZuLu0890: 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.

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