- Add GET /api/v1/users/check-id/{user_id} endpoint for real-time validation
- Replace frontend local validation with debounced API calls (500ms)
- Support exclude_user_id parameter for edit scenarios
- Add UserIdCheckResponse schema
- Maintain format validation (alphanumeric + underscore) on frontend
- Clean up timeout on component unmount
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: multica-agent <github@multica.ai>
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