Update AI Management docs to describe configurable workspace data source upload options. Adds notes that allowed file extensions and max file size are configurable (default 10 MB), and that deleting a data source removes its embeddings, chunks, and blob. Introduces a new "Configuring Data Source Upload Options" section with a WorkspaceDataSourceOptions example (AllowedFileExtensions, MaxFileSize, ContentTypeMap), lists available properties and helper methods (GetMaxFileSizeDisplay, GetAllowedExtensionsDisplay, GetAcceptAttribute), and a note about registering content extractors for new file types. Also documents the WorkspaceDataSourceManager repository responsibility for full cleanup.