Changed from os.environ.setdefault() to direct os.environ[] assignment for database, API, and auth config. This ensures config.json values override any pre-existing environment variables (including empty ones from .env files). Also added debug output to help diagnose config loading issues. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>