- Create centralized logger utility at frontend/src/utils/logger.ts
- Support debug/info/warn/error levels controlled by VITE_LOG_LEVEL
- Sanitize sensitive data (tokens, passwords, secrets) in log output
- Graceful fallback to 'info' level for invalid VITE_LOG_LEVEL values
- Add VITE_LOG_LEVEL to ImportMetaEnv type definitions
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>