feat: add queries for the campus

Application/Cqrs/Campus/Queries/GetCampusBasicInfoList/GetCampusBasicInfoListQueryHandler.cs

@@ -0,0 +1,26 @@
+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.Campus.Queries.GetCampusBasicInfoList;
+
+public class GetCampusBasicInfoListQueryHandler(ICampusDbContext dbContext) : IRequestHandler<GetCampusBasicInfoListQuery, CampusBasicInfoVm>
+{
+    public async Task<CampusBasicInfoVm> Handle(GetCampusBasicInfoListQuery request, CancellationToken cancellationToken)
+    {
+        var dtos = await dbContext.Campuses.Select(c => new CampusBasicInfoDto()
+        {
+            Id = c.Id,
+            CodeName = c.CodeName,
+            FullName = c.FullName
+        }).ToListAsync(cancellationToken);
+
+        return new CampusBasicInfoVm
+        {
+            Campuses = dtos
+        };
+    }
+}