[Backend] Propagate requestId into all log lines via withContext helper

[ogazboiz]

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Why this matters

logger.info calls across sorobanService.ts, eventIndexer.ts, and controllers do not consistently include the requestId. The middleware sets req.requestId and runWithRequestContext exists in utils/requestContext.ts, but many call sites bypass it. As a result, production tracing fails to correlate a user request to its downstream DB and RPC calls.

Acceptance criteria

• Audit all logger.info|warn|error call sites and ensure they go through a helper that pulls requestId from AsyncLocalStorage.
• Add a logger.withContext() helper that auto-merges requestId, userId, and loanId if present.
• Replace the largest 20 call sites (controllers + services) to use the helper.
• Add a Jest test using the supertest agent that asserts the response x-request-id matches the logged value.

Files to touch

• backend/src/utils/logger.ts
• backend/src/utils/requestContext.ts
• backend/src/controllers/*.ts (incremental)
• backend/src/services/*.ts (incremental)
• backend/src/__tests__/requestId.test.ts

Out of scope

• Switching to OpenTelemetry tracing (separate, larger effort).
• Replacing winston with pino.

[blurbeast]

@blurbeast has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hello my Chief, can i jump on this ?

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