- add TraceInterceptor that reads x-trace-id header or generates a UUID
- add AsyncLocalStorage store in common/trace-context for request-scoped trace ID
- replace NestJS Logger with TraceLogger (extends ConsoleLogger) that injects trace ID into log context
- register TraceInterceptor globally before LoggingInterceptor
- move HealthController into HealthModule so global interceptors apply to /healthz
- omit body/response from log lines when empty or null
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