feat(canvas): add visual annotation edit action

Add a VisualAnnotationPanel letting users mark regions on an image (brush,
circle, rectangle, cross) with per-mark edit instructions, composited into
an annotation guide image. The new "visual-annotation" node action sends
the unmarked source plus the annotated guide to the image model, editing
only numbered regions. Server validates the annotation image/instructions
and threads them through the generator task.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/internal/logic/run_node_action_async_logic.go

@@ -29,13 +29,14 @@ func NewRunNodeActionAsyncLogic(ctx context.Context, svcCtx *svc.ServiceContext)
 
 func (l *RunNodeActionAsyncLogic) RunNodeActionAsync(req *types.NodeActionRequest) (resp *types.ProjectResponse, err error) {
 	project, err := l.svcCtx.DesignService.RunNodeActionAsync(l.ctx, req.Id, req.NodeId, design.NodeActionRequest{
-		Action:     req.Action,
-		Prompt:     req.Prompt,
-		ImageModel: req.ImageModel,
-		ImageSize:  req.ImageSize,
-		Mask:       req.Mask,
-		Selection:  req.Selection,
-		Options:    req.Options,
+		Action:          req.Action,
+		Prompt:          req.Prompt,
+		ImageModel:      req.ImageModel,
+		ImageSize:       req.ImageSize,
+		Mask:            req.Mask,
+		Selection:       req.Selection,
+		AnnotationImage: req.AnnotationImage,
+		Options:         req.Options,
 	})
 	if err != nil {
 		return nil, err