feat: add queries for faculty

Application/Cqrs/Faculty/Queries/GetFacultyDetails/FacultyInfoVm.cs

@@ -0,0 +1,32 @@
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Queries.GetFacultyDetails;
+
+/// <summary>
+/// Represents faculties.
+/// </summary>
+public class FacultyInfoVm
+{
+    /// <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; }
+
+    /// <summary>
+    /// Campus name indicating the faculty's affiliation to the campus.
+    /// </summary>
+    public string? CampusName { get; set; }
+
+    /// <summary>
+    /// Campus code indicating the faculty's affiliation to the campus.
+    /// </summary>
+    public string? CampusCode { get; set; }
+}

Application/Cqrs/Faculty/Queries/GetFacultyDetails/GetFacultyInfoQuery.cs

@@ -0,0 +1,8 @@
+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Queries.GetFacultyDetails;
+
+public class GetFacultyInfoQuery : IRequest<FacultyInfoVm>
+{
+    public required int Id { get; set; }
+}

Application/Cqrs/Faculty/Queries/GetFacultyDetails/GetFacultyInfoQueryHandler.cs

@@ -0,0 +1,27 @@
+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.Faculty.Queries.GetFacultyDetails;
+
+public class GetFacultyInfoQueryHandler(IFacultyDbContext dbContext) : IRequestHandler<GetFacultyInfoQuery, FacultyInfoVm>
+{
+    public async Task<FacultyInfoVm> Handle(GetFacultyInfoQuery request, CancellationToken cancellationToken)
+    {
+        var faculty = await dbContext.Faculties
+            .Include(f => f.Campus)
+            .FirstOrDefaultAsync(f => f.Id == request.Id, cancellationToken) ?? throw new NotFoundException(typeof(Domain.Schedule.Faculty), request.Id);
+
+        return new FacultyInfoVm()
+        {
+            Id = faculty.Id,
+            Name = faculty.Name,
+            CampusId = faculty.CampusId,
+            CampusName = faculty.Campus?.FullName,
+            CampusCode = faculty.Campus?.CodeName
+        };
+    }
+}