feat(server): wire quality/count params and layered document generator

Map imageQuality/imageCount and output_format across the HTTP and
WebSocket handlers, pass them into the design service calls, and register
the layered document generator in the service context.

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

server/internal/logic/create_project_logic.go

@@ -31,7 +31,7 @@ func (l *CreateProjectLogic) CreateProject(req *types.CreateProjectRequest) (res
 		return nil, err
 	}
 
-	project, err := l.svcCtx.DesignService.CreateProject(l.ctx, req.Title, req.Prompt, req.ImageModel, req.ImageSize, req.EnableWebSearch)
+	project, err := l.svcCtx.DesignService.CreateProject(l.ctx, req.Title, req.Prompt, req.ImageModel, req.ImageSize, req.ImageQuality, int(req.ImageCount), req.EnableWebSearch)
 	if err != nil {
 		return nil, err
 	}