Same pattern in `resendResetPasswordVerificationOtp` — all errors become 500s

[Nabeelahh]

Area: Backend

• Description: resendResetPasswordVerificationOtp wraps its catch block the same way as resendVerificationOtp, swallowing typed HTTP exceptions and returning a 500 to the client for any error, including expected ones like NotFoundException.
• File(s): backend/src/auth/auth.service.ts, backend/src/auth/auth.service.spec.ts
• Priority: Medium
• Implementation & verification: Trace all controller, service, provider, and module-registration callers before changing the implementation so the DTO and HTTP-error contract remains stable. Add focused automated coverage for the reported failure mode and the expected successful path, mocking external services where applicable.
• Work distribution: Implementation: backend/src/auth/auth.service.ts. Integration: update the closest controller, module, DTO, or caller only if the service contract changes. Verification: backend/src/auth/auth.service.spec.ts.