VSN 445 / Backend : Preparing external necessary circuit service communication in the context of Setting up the logic of saving passengers / representatives by sheets importation in the preparation database

Integration of Circuit Service and Preparation of the Database

This merge request introduces the foundational elements required for communication with the external "Circuit Service" within the preparation microservice. It aligns with the logic of saving passengers and representatives through sheet importation into the preparation database.

Key contributions include:

• Definition of DTOs for passenger and representative lines
• Addition of complex and transitive entities to the preparation database
• Implementation of the Circuit Service and its necessary actions
• Configuration of external API paths
• Update of the changelog to reflect recent changes

This step lays the groundwork for upcoming interservice communications and adaptability testing.