Architecture overview: backend components diagram

[greatest0fallt1me]

Description

Add docs/ARCHITECTURE.md describing HTTP API, workers, DB, Redis, RPC clients, and data flow for settlements.

Requirements and context

• Mermaid diagram encouraged.
• Align with actual code layout.

Suggested execution

• Fork the repository and create a branch (example below).
• Implement changes in StreamPay-Backend (TypeScript / Express per package.json).
• Keep the service secure, tested, and documented; prefer small, reviewable PRs.

git checkout -b docs/backend-architecture

Implementation targets

• StreamPay-Backend/docs/ARCHITECTURE.md.

Tests and validation

• Peer review from team.

• Run npm test and npm run lint in StreamPay-Backend.

• Cover edge cases; include test output and brief security notes in the PR description.

Guidelines

• Target minimum 95% test coverage on new or changed backend code (or justify gaps).
• Clear documentation (OpenAPI / README / inline docs as specified).
• Timeframe: 96 hours from assignment.

Example commit message

docs(backend): architecture overview with diagram

[drips-wave]

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[Adedayo-Data]

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

Hi Maintainer!
it would be nice to work with StreamPay again. I would love to work on this issue. I have experience working on similar issues even with StreamPay and would love to finalize this. Thanks

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