fix(widget): Dockerfile 添加 Widget 构建步骤

主前端构建后执行 widget 构建，确保 login-widget.js 被 embed 打包

Dockerfile

@@ -10,6 +10,7 @@ RUN --mount=type=cache,target=/root/.bun/install/cache bun install
 COPY ./web .
 COPY ./VERSION .
 RUN DISABLE_ESLINT_PLUGIN='true' VITE_REACT_APP_VERSION=$(cat VERSION) bun run build
+RUN cd widget && bun install && bun run build
 
 FROM swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/library/golang:1.26.1-alpine AS builder2
 ENV GO111MODULE=on CGO_ENABLED=0