As a developer, I want to move Fertiscan's datastore logic into fertiscan-backend

[k-allagbe]

Description

Fertiscan-specific datastore logic is currently in ailab-datastore. It needs to be moved into fertiscan-backend to simplify ownership and maintenance.

Acceptance Criteria

• Fertiscan-backend contains all necessary datastore logic based on SQLAlchemy.
• Fertiscan-backend runs correctly using the moved logic.
• Existing functionality remains unchanged.