- Add jest.setup.js with JWT_SECRET for test environment
- Update jest.config.js with setupFiles and increased timeout
- Fix auth middleware to return 401 (not 403) for invalid JWT tokens
- Fix errorHandler to return 'message' instead of 'error' in response
- Fix validate middleware to properly detect Zod errors in ESM
- Remove unused 'pool' import in middleware tests (lint fix)
- Update middleware tests to check next() calls with AppError
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
