Added inline documentation + fixed small bugs

src/HopFrame.Api/Models/SingleValueResult.cs

@@ -1,5 +1,10 @@
 namespace HopFrame.Api.Models;
 
+/// <summary>
+/// Useful for endpoints that only return a single int or string
+/// </summary>
+/// <param name="value">The value of the result</param>
+/// <typeparam name="TValue">The type of the result</typeparam>
 public struct SingleValueResult<TValue>(TValue value) {
     public TValue Value { get; set; } = value;