Add enhancements to ActionController and CreateFakeAction

Refactored ActionController to include IMediator dependency
in the constructor. Updated CreateFakeAction method to:
- Set a default value for `endpointUri`.
- Add an optional `endpointPath` parameter and logic to
  construct a full URI.
- Include the `Active` property in CreateRecActionCommand.
- Ensure `endpointUri` is non-nullable.

Also added the `System.IO` namespace for potential future use.

src/ReC.API/Controllers/ActionController.cs

@@ -1,6 +1,7 @@
 using MediatR;
 using Microsoft.AspNetCore.Mvc;
 using ReC.Application.RecActions.Commands;
+using System.IO;
 
 namespace ReC.API.Controllers;
 
@@ -25,16 +26,21 @@ public class ActionController(IMediator mediator) : ControllerBase
 
     [HttpPost("fake")]
     public async Task<IActionResult> CreateFakeAction(
-        string? endpointUri = null,
+        string endpointUri = "https://jsonplaceholder.typicode.com/posts",
+        string? endpointPath = null,
         string type = "GET",
         string bodyQuery = "SELECT NULL AS REQUEST_BODY;")
     {
+        if (endpointPath is not null)
+            endpointUri = new Uri(new Uri(endpointUri.TrimEnd('/') + "/"), endpointPath.TrimStart('/')).ToString();
+
         await mediator.Send(new CreateRecActionCommand()
         {
             ProfileId = 2,
             EndpointUri = endpointUri,
             Type = type,
-            BodyQuery = bodyQuery
+            BodyQuery = bodyQuery,
+            Active = true,
         });
 
         return CreatedAtAction(nameof(CreateFakeAction), null);