refactor: move database-related projects to separate folder

SqlData/Application/Cqrs/LectureHall/Queries/GetLectureHallList/LectureHallLookupDto.cs

@@ -0,0 +1,22 @@
+namespace Mirea.Api.DataAccess.Application.Cqrs.LectureHall.Queries.GetLectureHallList;
+
+/// <summary>
+/// Represents lecture halls.
+/// </summary>
+public class LectureHallLookupDto
+{
+    /// <summary>
+    /// The unique identifier for the lecture hall.
+    /// </summary>
+    public int Id { get; set; }
+
+    /// <summary>
+    /// The name of the lecture hall.
+    /// </summary>
+    public required string Name { get; set; }
+
+    /// <summary>
+    /// ID indicating the lecture hall's affiliation to the campus.
+    /// </summary>
+    public int CampusId { get; set; }
+}