Allow multiple allergy inputs and save them for future use.

[kenako1]

As a manager, I want to input multiple allergies for each worker, so that all restrictions are captured.

[kenako1]

🔹 Definition of Done:
✔️ Allergy data is persistently stored in the database for future menu planning.
✔️ Managers can update or remove allergy information at any time.
✔️ The system automatically syncs changes across menu planning modules.
✔️ Data integrity is ensured (no duplication or data loss).
✔️ Role-based access controls (RBAC) are implemented to restrict who can edit/view allergy data.
✔️ Frontend and backend error handling is implemented for smooth user experience.
✔️ Feature passes unit, integration, and security testing.
✔️ Feature demo successfully completed.