feat: add background fill functionality for layers

- Implemented FillLayerBackgroundCommand to fill the background of layers with a specified color.
- Introduced BackgroundFillManager to manage background fill operations.
- Updated LayerManager to include fillLayerBackground method.
- Enhanced LayersPanel with a color picker for filling layer backgrounds.
- Modified RasterizeLayerCommand to reflect changes in terminology and functionality.
- Adjusted LayerSort to ensure filled layers are rendered at the correct z-index.
- Updated relevant utility functions and components to support new fill feature.

src/component/Canvas/CanvasEditor/commands/UpdateGroupMaskPositionCommand.js

@@ -206,6 +206,16 @@ export class UpdateGroupMaskPositionCommand extends Command {
         }
       });
 
+      if (layer?.fill) {
+        // 更新组图层的填充颜色
+        const fabricObject = this.canvas.getObjects().find((o) => o.id === layer?.fill.id);
+        if (fabricObject) {
+          fabricObject.clipPath = clippingMaskFabricObject;
+          fabricObject.dirty = true;
+          fabricObject.setCoords();
+        }
+      }
+
       if (isUndo) {
         this.activeSelection.set({
           left: this.originalSelectionPosition.left - this.deltaX,