build(docker): add Docker build and deployment infrastructure

- Add multi-stage Dockerfile with pnpm install and Nginx serving
- Add nginx.conf with gzip and SPA fallback
- Add docker-build.sh script for building and pushing images
- Add .dockerignore for build context optimization
- Remove unused pnpm-workspace.yaml

scripts/docker-build.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+set -e
+
+cd "$(dirname "$0")/.."
+
+REGISTRY="${GITEA_REGISTRY:-git.msksbr.com}"
+USERNAME="${GITEA_USERNAME:-msksbr}"
+IMAGE="$REGISTRY/$USERNAME/bookmgr-client"
+VERSION=$(node -e "console.log(require('./package.json').version)")
+
+echo ">>> 版本: $VERSION"
+echo ">>> 镜像: $IMAGE"
+
+echo ">>> 构建镜像..."
+docker build \
+  --network=host \
+  -t "$IMAGE:$VERSION" \
+  -t "$IMAGE:latest" \
+  .
+
+echo ">>> 推送镜像..."
+docker push "$IMAGE:$VERSION"
+docker push "$IMAGE:latest"
+
+echo ""
+echo "完成！"
+echo "  镜像: $IMAGE:$VERSION"
+echo "  镜像: $IMAGE:latest"
+echo ""
+echo "部署："
+echo "  docker run -d -p 80:80 $IMAGE:$VERSION"