feat: ret dir item parent id in dir content query

apps/backend/internal/catalog/file.go

@@ -18,6 +18,8 @@ type FileInfo struct {
 	Kind string `json:"kind" example:"file"`
 	// Unique file identifier
 	ID string `json:"id" example:"mElnUNCm8F22"`
+	// ParentID is the pbulic ID of the directory this file is in
+	ParentID string `json:"parentId,omitempty" exmaple:"kRp2XYTq9A55"`
 	// File name
 	Name string `json:"name" example:"document.pdf"`
 	// File size in bytes