Refactor and enhance JSON handling with extensions

Refactored `ConfigExtensions.cs` to move `ConfigurationExtensions`
to the `ReC.API.Extensions` namespace and re-added the
`GetFakeProfileId` method. Introduced `JsonExtensions.cs` with
a `JsonToDynamic` method for recursive JSON deserialization,
simplifying nested JSON handling. Updated `OutResController.cs`
and `RecActionController.cs` to use the new `JsonToDynamic`
method, improving code readability and reducing duplication.
Overall, modularized and cleaned up code for better maintainability.

src/ReC.API/Controllers/OutResController.cs

@@ -1,9 +1,8 @@
 using MediatR;
 using Microsoft.AspNetCore.Mvc;
-using ReC.API.Models;
+using ReC.API.Extensions;
 using ReC.Application.OutResults.Queries;
 using System.Net.Mime;
-using System.Text.Json;
 
 namespace ReC.API.Controllers;
 
@@ -34,8 +33,8 @@ public class OutResController(IMediator mediator, IConfiguration config) : Contr
 
         return resultType switch
         {
-            ResultType.Body => res.Body is null ? Ok(new object { }) : Ok(JsonSerializer.Deserialize<dynamic>(res.Body)),
-            ResultType.Header => res.Header is null ? Ok(new object { }) : Ok(JsonSerializer.Deserialize<dynamic>(res.Header)),
+            ResultType.Body => res.Body is null ? Ok(new object { }) : Ok(res.Body.JsonToDynamic()),
+            ResultType.Header => res.Header is null ? Ok(new object { }) : Ok(res.Header.JsonToDynamic()),
             _ => Ok(res),
         };
     }

src/ReC.API/Controllers/RecActionController.cs

@@ -1,5 +1,6 @@
 using MediatR;
 using Microsoft.AspNetCore.Mvc;
+using ReC.API.Extensions;
 using ReC.API.Models;
 using ReC.Application.RecActions.Commands;
 using ReC.Application.RecActions.Queries;