refactor: move database-related projects to separate folder

SqlData/Application/Cqrs/Faculty/Queries/GetFacultyList/FacultyListVm.cs

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+using System.Collections.Generic;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Queries.GetFacultyList;
+
+/// <summary>
+/// Represents a view model containing multiple faculties.
+/// </summary>
+public class FacultyListVm
+{
+    /// <summary>
+    /// The list of faculties.
+    /// </summary>
+    public IList<FacultyLookupDto> Faculties { get; set; } = new List<FacultyLookupDto>();
+}

SqlData/Application/Cqrs/Faculty/Queries/GetFacultyList/FacultyLookupDto.cs

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+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Queries.GetFacultyList;
+
+/// <summary>
+/// Represents faculties.
+/// </summary>
+public class FacultyLookupDto
+{
+    /// <summary>
+    /// The unique identifier for the faculty.
+    /// </summary>
+    public int Id { get; set; }
+
+    /// <summary>
+    /// The name of the faculty.
+    /// </summary>
+    public required string Name { get; set; }
+
+    /// <summary>
+    /// ID indicating the faculty's affiliation to the campus.
+    /// </summary>
+    public int? CampusId { get; set; }
+}

SqlData/Application/Cqrs/Faculty/Queries/GetFacultyList/GetFacultyListQuery.cs

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+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Queries.GetFacultyList;
+
+public class GetFacultyListQuery : IRequest<FacultyListVm>
+{
+    public int? Page { get; set; }
+    public int? PageSize { get; set; }
+}

SqlData/Application/Cqrs/Faculty/Queries/GetFacultyList/GetFacultyListQueryHandler.cs

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+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Mirea.Api.DataAccess.Application.Interfaces.DbContexts.Schedule;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Queries.GetFacultyList;
+
+public class GetFacultyListQueryHandler(IFacultyDbContext dbContext) : IRequestHandler<GetFacultyListQuery, FacultyListVm>
+{
+    public async Task<FacultyListVm> Handle(GetFacultyListQuery request, CancellationToken cancellationToken)
+    {
+        var dtos = dbContext.Faculties.OrderBy(f => f.Id).Select(f => new FacultyLookupDto()
+        {
+            Id = f.Id,
+            Name = f.Name,
+            CampusId = f.CampusId
+        });
+
+        if (request is { PageSize: not null, Page: not null })
+            dtos = dtos.Skip(request.Page.Value * request.PageSize.Value).Take(request.PageSize.Value);
+
+        var result = await dtos.ToListAsync(cancellationToken);
+
+        return new FacultyListVm
+        {
+            Faculties = result
+        };
+    }
+}