item_validator_service_interface

Interface for Item Validator services.

Contract for validators responsible for checking universal rules for Item DTOs, such as metadata structure and base field formats. Extension-specific validators should extend this contract when introducing custom validation requirements.

Responsibilities:

• Validate DTO integrity for create/update operations
• Validate TYPE format (implementation must not enforce required TYPE on create)
• Validate status format (without enforcing a fixed list)
• Validate metadata structure and safety

This interface MUST NOT define methods related to business logic, required fields for specific item types, or workflow rules.