Add ILogger support for enhanced API call logging

Introduced optional ILogger support across BaseCrudApi and its
derived classes to enable logging of API call outcomes. Updated
constructors to accept an optional ILogger parameter, with
conditional compilation for .NET Framework compatibility.

Replaced EnsureSuccessAsync with HandleResponseAsync in CRUD
methods to integrate logging. Updated derived API classes
(CommonApi, EndpointAuthApi, EndpointParamsApi, EndpointsApi,
ProfileApi, RecActionApi, ResultApi) to pass ILogger to the base
class.

Added Microsoft.Extensions.Logging imports and ensured backward
compatibility by making ILogger optional and handling nullable
reference types in non-.NET Framework environments.

src/ReC.Client/Api/EndpointsApi.cs

@@ -1,6 +1,7 @@
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace ReC.Client.Api
 {
@@ -13,7 +14,12 @@ namespace ReC.Client.Api
         /// Initializes a new instance of the <see cref="EndpointsApi"/> class.
         /// </summary>
         /// <param name="http">The HTTP client used for requests.</param>
-        public EndpointsApi(HttpClient http) : base(http, "api/Endpoints")
+        /// <param name="logger">An optional logger used to record API call outcomes.</param>
+#if NETFRAMEWORK
+        public EndpointsApi(HttpClient http, ILogger logger = null) : base(http, "api/Endpoints", logger)
+#else
+        public EndpointsApi(HttpClient http, ILogger? logger = null) : base(http, "api/Endpoints", logger)
+#endif
         {
         }
     }