feat(status-dashboard): add audit logging system
Implement comprehensive audit logging with:
- AuditLoggingInterceptor: Request/response logging with <2ms overhead
- JsonLoggerService: Structured JSON output for SIEM integration
- Log rotation: 90-day retention with daily rotation
- Unit tests: 9 passing tests for interceptor behavior
Captures: IP, user-agent, method, path, query, status, response time,
mTLS user (from X-SSL-Client-S-DN), request/response timestamps.
Includes implementation guide and logrotate configuration.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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