feat: add queries for the campus

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

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+namespace Mirea.Api.DataAccess.Application.Cqrs.Campus.Queries.GetCampusBasicInfoList;
+
+/// <summary>
+/// Represents basic information about a campus.
+/// </summary>
+public class CampusBasicInfoDto
+{
+    /// <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; }
+}

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

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+using System.Collections.Generic;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Campus.Queries.GetCampusBasicInfoList;
+
+/// <summary>
+/// Represents a view model containing basic information about multiple campuses.
+/// </summary>
+public class CampusBasicInfoVm
+{
+    /// <summary>
+    /// The list of campus basic information.
+    /// </summary>
+    public IList<CampusBasicInfoDto> Campuses { get; set; } = new List<CampusBasicInfoDto>();
+}

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

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+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Campus.Queries.GetCampusBasicInfoList;
+
+public class GetCampusBasicInfoListQuery : IRequest<CampusBasicInfoVm>;

Application/Cqrs/Campus/Queries/GetCampusBasicInfoList/GetCampusBasicInfoListQueryHandler.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.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
+        };
+    }
+}

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

@@ -0,0 +1,27 @@
+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; }
+}

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

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

Application/Cqrs/Campus/Queries/GetCampusDetails/GetCampusDetailsQueryHandler.cs

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+using System.Globalization;
+using System.Linq;
+using MediatR;
+using Mirea.Api.DataAccess.Application.Cqrs.Campus.Queries.GetCampusBasicInfoList;
+using Mirea.Api.DataAccess.Application.Interfaces.DbContexts.Schedule;
+using System.Threading.Tasks;
+using System.Threading;
+using Microsoft.EntityFrameworkCore;
+using Mirea.Api.DataAccess.Application.Common.Exceptions;
+
+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
+        };
+    }
+}