Refactor API method names for consistency and clarity

Renamed public API methods across ReC.Client.Api classes to use concise and uniform names (e.g., CreateAsync, UpdateAsync, DeleteAsync, GetAsync, InvokeAsync). Removed obsolete NETFRAMEWORK preprocessor blocks. Updated summary comment for Results property in ReCClient.cs. These changes improve naming consistency and code clarity throughout the client library.

src/ReC.Client/ReCClient.cs

@@ -1,7 +1,7 @@
 using Microsoft.Extensions.DependencyInjection;
 using System;
 using System.Net.Http;
-using System.Threading.Tasks;
+using ReC.Client.Api;
 
 namespace ReC.Client
 {
@@ -23,7 +23,7 @@ namespace ReC.Client
         public RecActionApi RecActions { get; }
 
         /// <summary>
-        /// Provides access to OutRes endpoints.
+        /// Provides access to Result endpoints.
         /// </summary>
         public ResultApi Results { get; }