feat: write a dto in a separate project

ApiDto/Responses/CampusBasicInfoResponse.cs

@@ -0,0 +1,22 @@
+namespace Mirea.Api.Dto.Responses;
+
+/// <summary>
+/// Represents basic information about a campus.
+/// </summary>
+public class CampusBasicInfoResponse
+{
+    /// <summary>
+    /// Gets or sets the unique identifier of the campus.
+    /// </summary>
+    public int Id { get; set; }
+
+    /// <summary>
+    /// Gets or sets the code name of the campus.
+    /// </summary>
+    public required string CodeName { get; set; }
+
+    /// <summary>
+    /// Gets or sets the full name of the campus (optional).
+    /// </summary>
+    public string? FullName { get; set; }
+}