Refactor HTTP client setup in BuildStaticClient

Simplified the HTTP client configuration in the `BuildStaticClient` method of the `ReC.Client` namespace. Replaced the explicit use of `Services.AddHttpClient` with a call to `Services.AddRecClient(apiUri)`. This change improves code readability and reusability by encapsulating the HTTP client setup logic in a dedicated method or extension.

src/ReC.Client/ReCClient.cs

@@ -84,10 +84,7 @@ namespace ReC.Client
             if(Provider != null)
                 throw new InvalidOperationException("Static Provider is already built.");
 
-            Services.AddHttpClient(ClientName, client =>
-            {
-                client.BaseAddress = new Uri(apiUri);
-            });
+            Services.AddRecClient(apiUri);
             Provider = Services.BuildServiceProvider();
         }