refactor: move database-related projects to separate folder

SqlData/Application/Cqrs/Campus/Queries/GetCampusDetails/CampusDetailsVm.cs

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+namespace Mirea.Api.DataAccess.Application.Cqrs.Campus.Queries.GetCampusDetails;
+
+/// <summary>
+/// Represents a view model containing detailed information about a campus.
+/// </summary>
+public class CampusDetailsVm
+{
+    /// <summary>
+    /// The unique identifier for the campus.
+    /// </summary>
+    public int Id { get; set; }
+
+    /// <summary>
+    /// The code name associated with the campus.
+    /// </summary>
+    public required string CodeName { get; set; }
+
+    /// <summary>
+    /// The full name of the campus.
+    /// </summary>
+    public string? FullName { get; set; }
+
+    /// <summary>
+    /// The address of the campus.
+    /// </summary>
+    public string? Address { get; set; }
+}

SqlData/Application/Cqrs/Campus/Queries/GetCampusDetails/GetCampusDetailsQuery.cs

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+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Campus.Queries.GetCampusDetails;
+
+public class GetCampusDetailsQuery : IRequest<CampusDetailsVm>
+{
+    public required int Id { get; set; }
+}

SqlData/Application/Cqrs/Campus/Queries/GetCampusDetails/GetCampusDetailsQueryHandler.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.Campus.Queries.GetCampusDetails;
+
+public class GetCampusDetailsQueryHandler(ICampusDbContext dbContext) : IRequestHandler<GetCampusDetailsQuery, CampusDetailsVm>
+{
+    public async Task<CampusDetailsVm> Handle(GetCampusDetailsQuery request, CancellationToken cancellationToken)
+    {
+        var campus = await dbContext.Campuses.FirstOrDefaultAsync(c => c.Id == request.Id, cancellationToken) ?? throw new NotFoundException(typeof(Domain.Schedule.Campus), request.Id);
+
+        return new CampusDetailsVm()
+        {
+            Id = campus.Id,
+            CodeName = campus.CodeName,
+            FullName = campus.FullName,
+            Address = campus.Address
+        };
+    }
+}