- Fix API-002 in admin/settings.py: use service layer for DB delete
- Fix API-001/API-003 in vendor/email_settings.py: add Pydantic response
models, remove HTTPException raises
- Fix SVC-002/SVC-006 in vendor_email_settings_service.py: use domain
exceptions, change db.commit() to db.flush()
- Add unit tests for VendorEmailSettingsService
- Add integration tests for vendor and admin email settings APIs
- Add user guide (docs/guides/email-settings.md)
- Add developer guide (docs/implementation/email-settings.md)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>