[Docs] Add System Architecture Diagram

[Abd-Standard]

Description

Document the overall NotifyChain architecture and component interactions.

Acceptance Criteria
Diagram reflects current implementation.
Data flow is clearly explained.
Documentation is added to the project wiki.

[Onyedika3d]

Hello maintainers, I would like to work on this issue. I have analyzed the issue and reviewed the relevant parts of the codebase to fully understand the expected behavior and required changes. Based on my assessment, I am confident in the implementation approach needed to resolve it effectively. I have experience working with Node.js, TypeScript, NestJS, PostgreSQL, and MongoDB, and I will ensure the solution is clean, well-tested, and aligned with the project’s coding standards while also making sure existing functionality is not affected. I would appreciate the opportunity to take this on and contribute to the project.

[ZuLu0890]

I would like to work on this issue

[leocagli]

Happy to contribute here — please assign me so I can begin implementation.

[CollinsC1O]

@CollinsC1O has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would love to work on this issue and provide implementations to fulfill it.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @CollinsC1O to this issue.

[drips-wave]

Congratulations, @CollinsC1O! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @CollinsC1O: 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

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@CollinsC1O's PR #234 was approved and merged by @Abd-Standard.

🏆 @CollinsC1O: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (751 total points). Track your full progress on GrantFox.

👏 Great work, @CollinsC1O! Keep contributing to Core-Foundry.

[drips-wave]

This issue has been completed by @CollinsC1O as part of the Stellar Wave Program's 6th Wave 🥳

😎 @CollinsC1O: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.