Add Architecture Decision Records (ADRs) for Major Decisions

[Pidoko257]

Description

Document major architectural decisions (GraphQL adoption, BullMQ for queues, Redis for caching) with rationale and alternatives.

Acceptance Criteria

• 15+ ADRs written
• Linked from README
• Includes decision date and owner
• Reviewed by team

Implementation Notes

• Create adr/ directory
• Use ADR template
• Write for major decisions
• Link from docs

[code-ony]

@code-ony has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to work on this issue, please assign it to me

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

[Chuks-coderr]

@Chuks-coderr has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

i would like to work on this project

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

[drips-wave]

Congratulations, @Chuks-coderr! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Chuks-coderr: 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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