OpenTelemetry tracing for HTTP and outbound RPC

[greatest0fallt1me]

Description

Add OTel traces propagating to Soroban RPC and DB calls (where supported).

Requirements and context

• Sampling configurable.
• Document exporter env (OTLP).

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 feature/opentelemetry-tracing

Implementation targets

• src/telemetry/tracing.ts.
• Wrap fetch/HTTP clients.

Tests and validation

• Local dev: console exporter optional.

• 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

feat(backend): OpenTelemetry tracing

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[RemmyAcee]

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

Based on your request, I will implement and fix this issue according to the design requirement and to fit your acceptance criteria

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[drips-wave]

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

🧑‍💻 @RemmyAcee: 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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