Start to implement the VideoService list_root_folder method.

backend/exposition/src/lib.rs

@@ -1,9 +1,7 @@
 extern crate core;
 
-use crate::user::validator::validator;
 use actix_web::web::ServiceConfig;
 use actix_web::{get, web, HttpResponse, Responder};
-use actix_web_httpauth::middleware::HttpAuthentication;
 use crate::video::handler::download_file;
 
 pub mod user;

backend/exposition/src/video/video_format_content_type_mapper.rs

@@ -1,4 +1,4 @@
-use lumiere_domain::video::model::VideoFormat;
+use lumiere_domain::video::library_item::VideoFormat;
 
 pub fn map_to_content_type(video_format: &VideoFormat) -> &'static str {
     match video_format {