refactor: move database-related projects to separate folder

SqlData/Application/Cqrs/LectureHall/Queries/GetLectureHallDetails/GetLectureHallInfoQuery.cs

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+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.LectureHall.Queries.GetLectureHallDetails;
+
+public class GetLectureHallInfoQuery : IRequest<LectureHallInfoVm>
+{
+    public required int Id { get; set; }
+}

SqlData/Application/Cqrs/LectureHall/Queries/GetLectureHallDetails/GetLectureHallInfoQueryHandler.cs

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+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Mirea.Api.DataAccess.Application.Common.Exceptions;
+using Mirea.Api.DataAccess.Application.Interfaces.DbContexts.Schedule;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.LectureHall.Queries.GetLectureHallDetails;
+
+public class GetLectureHallInfoQueryHandler(ILectureHallDbContext dbContext) : IRequestHandler<GetLectureHallInfoQuery, LectureHallInfoVm>
+{
+    public async Task<LectureHallInfoVm> Handle(GetLectureHallInfoQuery request, CancellationToken cancellationToken)
+    {
+        var lectureHall = await dbContext.LectureHalls
+            .Include(l => l.Campus)
+            .FirstOrDefaultAsync(l => l.Id == request.Id, cancellationToken)
+                          ?? throw new NotFoundException(typeof(Domain.Schedule.LectureHall), request.Id);
+
+        return new LectureHallInfoVm()
+        {
+            Id = lectureHall.Id,
+            Name = lectureHall.Name,
+            CampusId = lectureHall.CampusId,
+            CampusCode = lectureHall.Campus?.CodeName,
+            CampusName = lectureHall.Campus?.FullName
+        };
+    }
+}

SqlData/Application/Cqrs/LectureHall/Queries/GetLectureHallDetails/LectureHallInfoVm.cs

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+namespace Mirea.Api.DataAccess.Application.Cqrs.LectureHall.Queries.GetLectureHallDetails;
+
+/// <summary>
+/// Represents disciplines.
+/// </summary>
+public class LectureHallInfoVm
+{
+    /// <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; }
+
+    /// <summary>
+    /// Campus name indicating the lecture hall's affiliation to the campus.
+    /// </summary>
+    public string? CampusName { get; set; }
+
+    /// <summary>
+    /// Campus code indicating the lecture hall's affiliation to the campus.
+    /// </summary>
+    public string? CampusCode { get; set; }
+}