Added transcription of audio and video files to local data sources (#1081)

Co-authored-by: Paul Koudelka <106623909+PaulKoudelka@users.noreply.github.com>

app/MindWork AI Studio/Tools/Databases/IndexStore/EmbeddingStateFileEntity.cs

@@ -26,6 +26,8 @@ internal sealed class EmbeddingStateFileEntity
 
     public int ChunkCount { get; set; }
 
+    public string? TranscriptKey { get; set; }
+
     public EmbeddingStateDataSourceEntity? DataSource { get; set; }
 
     public List<EmbeddingStateChunkEntity> Chunks { get; set; } = [];