Refactor - Preprints Feature

[rrromchIk]

Services

• Decomposed large services into smaller, entity-focused services.
• Renamed services for consistency and better readability.

Models

• Decomposed model files for better separation of concerns.
• Reused existing shared models where appropriate.
• Moved some models to the shared.

State

• Renamed NGXS states for improved clarity and alignment with feature naming.

Components

• Renamed components to follow a consistent naming convention.
• Reorganized component folder structure to better reflect feature hierarchy and usage.