feat: Teilnehmerlisten in Lerngruppen importieren

LehrerApp.Core/Importing/StudentImportModels.cs

@@ -32,6 +32,8 @@ public sealed record ImportedStudent
 public static class StudentImportFormats
 {
     public static readonly ImportFormatId MasterDataCsv = new("student-master-data.csv");
+    public static readonly ImportFormatId LessonStudentListCsv = new("lesson-student-list.csv");
+    public static readonly ImportFormatId MarksPerLessonCsv = new("marks-per-lesson.csv");
 }
 
 public enum StudentImportResolutionKind { CreateNew, UseExisting, Skip }
@@ -60,6 +62,7 @@ public sealed class StudentImportPreview
     public IReadOnlyList<ImportMessage> Messages { get; }
     public IReadOnlyList<ImportConflict> Conflicts { get; }
     public IReadOnlyList<StudentImportGroupAssignment> GroupAssignments { get; }
+    public Guid? TargetGroupId { get; }
     internal string ExistingStudentsFingerprint { get; }
     internal string GroupStateFingerprint { get; }
 
@@ -73,6 +76,7 @@ public sealed class StudentImportPreview
         IEnumerable<ImportMessage> messages,
         IEnumerable<ImportConflict> conflicts,
         IEnumerable<StudentImportGroupAssignment> groupAssignments,
+        Guid? targetGroupId,
         string existingStudentsFingerprint,
         string groupStateFingerprint)
     {
@@ -82,6 +86,7 @@ public sealed class StudentImportPreview
         Messages = ReadOnly(messages);
         Conflicts = ReadOnly(conflicts);
         GroupAssignments = ReadOnly(groupAssignments);
+        TargetGroupId = targetGroupId;
         ExistingStudentsFingerprint = existingStudentsFingerprint;
         GroupStateFingerprint = groupStateFingerprint;
     }