refactored the classes and functions

app/MindWork AI Studio/Tools/Services/FileEnumerationResult.cs

@@ -0,0 +1,19 @@
+namespace AIStudio.Tools.Services;
+
+public sealed class FileEnumerationResult
+{
+    public List<FileInfo> Files { get; } = [];
+
+    public List<DataSourceEmbeddingFailure> Failures { get; } = [];
+
+    public int FailedFiles { get; set; }
+
+    public string LastError { get; set; } = string.Empty;
+
+    public void AddFailure(string filePath, string reason)
+    {
+        this.Failures.Add(new DataSourceEmbeddingFailure(filePath, reason));
+        this.FailedFiles = this.Failures.Count;
+        this.LastError = reason;
+    }
+}