Add event payload docs for quote-related fields

[Chucks1093]

Summary
Add event payload docs for quote-related fields

Scope

• document event payload fields tied to quote calculations\n- specify expected types and semantics\n- include compatibility notes for indexers

Acceptance Criteria

• scoped change is implemented with no unrelated file churn
• docs/tests are updated where applicable
• contributor can validate the outcome locally

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[victor62-art]

@victor62-art has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

love to work on this
pls assign

ℹ️ Repo Maintainers: To accept this application, review their application or assign @victor62-art to this issue.

[drips-wave]

Congratulations, @victor62-art! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @victor62-art: 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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