# Task ID: 4
**Title:** Set up Structured Logging System
**Status:** done
**Dependencies:** 3 ✓
**Priority:** medium
**Description:** Implement configurable logging with support for different levels and formats (simple/JSON)
**Details:**
Create logger.ts in utils/ using winston or similar library. Support LOG_LEVEL (error, warn, info, debug) and LOG_FORMAT (simple, json). Simple format for development console output, JSON format for production structured logging. Include timestamp, level, message, and optional metadata fields.
**Test Strategy:**
Test different log levels are filtered correctly, JSON format produces valid JSON, simple format is human-readable
