Move AddedWho config to RecActionOptions and refactor usage

Centralize AddedWho under RecAction in appsettings.json and add it to RecActionOptions. Update InvokeRecActionViewCommandHandler to use IOptions<RecActionOptions> for strongly-typed configuration access, replacing previous config-based retrieval. Removes global AddedWho property for improved maintainability.

src/ReC.Application/RecActions/Commands/InvokeRecActionViewCommand.cs

@@ -20,11 +20,14 @@ public record InvokeRecActionViewCommand : IRequest<bool>
 }
 
 public class InvokeRecActionViewCommandHandler(
+    IOptions<RecActionOptions> options,
     ISender sender,
     IHttpClientFactory clientFactory,
     IConfiguration? config = null
     ) : IRequestHandler<InvokeRecActionViewCommand, bool>
 {
+    private readonly RecActionOptions _options = options.Value;
+
     public async Task<bool> Handle(InvokeRecActionViewCommand request, CancellationToken cancel)
     {
         var action = request.Action;
@@ -135,7 +138,7 @@ public class InvokeRecActionViewCommandHandler(
             ActionId = action.Id,
             Header = JsonSerializer.Serialize(resHeaders, options: new() { WriteIndented = false }),
             Body = resBody
-        }, config?["AddedWho"], cancel);
+            }, _options.AddedWho, cancel);
 
         return response.IsSuccessStatusCode;
     }