[Contract] Define TRANSFER_FEE_BPS constant

[Yunusabdul38]

Description: Standardize the ticket transfer fee logic by replacing magic numbers with a named constant TRANSFER_FEE_BPS. Tasks:

Identify hardcoded fee values in transfer_ticket.
Define pub const TRANSFER_FEE_BPS: u32 = ...; in a central location.
Update implementation to use the new constant.

[Rajkoli145]

@Rajkoli145 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi @Agora-Events,
I’d like to work on this issue.

I’ll define the TRANSFER_FEE_BPS constant in the contract, keeping it consistent with the existing structure and ensuring everything passes CI.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Rajkoli145 to this issue.

[Simongodw]

@Simongodw has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I can define and document TRANSFER_FEE_BPS cleanly, ensure consistent usage across the contract, and keep it audit-friendly with no risk to existing logic.

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

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

🧑‍💻 @Simongodw: 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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This issue has been completed by @Simongodw as part of the Stellar Wave Program's 3rd Wave 🥳

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