feat: 添加docker部署

frontend/Dockerfile

@@ -0,0 +1,22 @@
+#
+# Multi-stage build for Vue (Vite) frontend, served by Nginx.
+#
+# Build:
+#   docker build -f frontend/Dockerfile -t feedsystem-frontend .
+#
+
+FROM node:24-alpine AS build
+WORKDIR /src
+
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+
+COPY frontend/ ./
+RUN npm run build
+
+FROM nginx:1.27-alpine
+COPY frontend/nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /src/dist /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]
+