refactor: move database-related projects to separate folder

SqlData/Application/Cqrs/Discipline/Queries/GetDisciplineDetails/DisciplineInfoVm.cs

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+namespace Mirea.Api.DataAccess.Application.Cqrs.Discipline.Queries.GetDisciplineDetails;
+
+/// <summary>
+/// Represents disciplines.
+/// </summary>
+public class DisciplineInfoVm
+{
+    /// <summary>
+    /// The unique identifier for the discipline.
+    /// </summary>
+    public int Id { get; set; }
+
+    /// <summary>
+    /// The name of the discipline.
+    /// </summary>
+    public required string Name { get; set; }
+}

SqlData/Application/Cqrs/Discipline/Queries/GetDisciplineDetails/GetDisciplineInfoQuery.cs

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+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Discipline.Queries.GetDisciplineDetails;
+
+public class GetDisciplineInfoQuery : IRequest<DisciplineInfoVm>
+{
+    public required int Id { get; set; }
+}

SqlData/Application/Cqrs/Discipline/Queries/GetDisciplineDetails/GetDisciplineInfoQueryHandler.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.Discipline.Queries.GetDisciplineDetails;
+
+public class GetDisciplineInfoQueryHandler(IDisciplineDbContext dbContext) : IRequestHandler<GetDisciplineInfoQuery, DisciplineInfoVm>
+{
+    public async Task<DisciplineInfoVm> Handle(GetDisciplineInfoQuery request, CancellationToken cancellationToken)
+    {
+        var discipline = await dbContext.Disciplines.FirstOrDefaultAsync(d => d.Id == request.Id, cancellationToken) ?? throw new NotFoundException(typeof(Domain.Schedule.Discipline), request.Id);
+
+        return new DisciplineInfoVm()
+        {
+            Id = discipline.Id,
+            Name = discipline.Name,
+        };
+    }
+}