Propagate request IDs to responses and error bodies

[zhangsiqiang519]

Summary

• Return x-request-id on HTTP responses when a request id is present.
• Include the request id in HTTP error response bodies for support/debug correlation.
• Add focused tests for the middleware and exception filter behavior.

Closes #178

Verification

• npm test --workspace=apps/backend -- --runTestsByPath src/common/middleware/logger.middleware.spec.ts src/common/filters/http-exception.filter.spec.ts src/common/json-logger.service.spec.ts --runInBand
• npm run lint --workspace=apps/backend
• npm run build --workspace=apps/backend
• npm run test --workspace=apps/backend -- --runInBand
• git diff --check

[GBOYEE]

I'm interested in tackling this! I have strong experience with full-stack and can deliver a clean solution.

[GBOYEE]

Can I take this? backend fix, straightforward scope. Will submit PR in ~1hr. Closes #300

[GBOYEE]

I'd like to work on this.

Approach:

• I'll write the test cases and ensure they pass with full coverage
• Verify with existing tests + add new ones if needed

Estimated effort: ~1-2 hours. PR incoming shortly.
Closes #300

[Xuccessor]

Thanks for this. Issue #178 is assigned to @egwujiohaifesinachiperpetual-max, so I'm holding off. Worth coordinating in the issue thread before opening or landing.

[Xuccessor]

Closing this — #178 is assigned to @egwujiohaifesinachiperpetual-max. Thanks for the work, feel free to coordinate on the issue.