修复了一点bug，然后增加了图层拆分更多的功能

lib/seedream/layer-composition.ts

@@ -0,0 +1,28 @@
+export type SeedreamLayerBox = [number, number, number, number];
+
+export type SeedreamLayerSource = "provider" | "upload" | "library" | "seedream-edit";
+
+export type SeedreamCompositionLayer = {
+  id: string;
+  assetId: string;
+  name: string;
+  description?: string;
+  visible: boolean;
+  box: SeedreamLayerBox;
+  rotation: number;
+  source: SeedreamLayerSource;
+  editJobId?: string;
+  originalAssetId?: string;
+};
+
+export type SeedreamLayerComposition = {
+  jobId: string;
+  baseAssetId: string;
+  baseVisible: boolean;
+  layers: SeedreamCompositionLayer[];
+  version: number;
+  createdAt: string;
+  updatedAt: string;
+};
+
+export type SeedreamLayerDraft = Pick<SeedreamLayerComposition, "baseAssetId" | "baseVisible" | "layers">;