Implement file saving service in files controller

Removed outdated TODO comments and enabled `filesService.save` to handle file saving logic. This change ensures that files are properly processed and stored, providing a success message upon completion.

apps/backend/src/app/files/files.controller.ts

@@ -62,10 +62,8 @@ export class FilesController {
 				Params.set("isRestricted", Boolean(_isRestricted));
 			}
 
-			//TODO Implement the service
-			//await this.filesService.save(fileBuffer, Params);
+			await this.filesService.save(fileBuffer, Params);
 
-			// TODO logique de sauvegarde du fichier et des données
 
 			return { message: "Fichier sauvegardé avec succès" };
 		});