feat: 添加docker部署

frontend/.dockerignore

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+.git
+node_modules
+dist
+**/*.log
+npm-debug.log*
+

frontend/Dockerfile

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+#
+# 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;"]
+

frontend/nginx.conf

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+server {
+  listen 80;
+  server_name _;
+
+  root /usr/share/nginx/html;
+  index index.html;
+
+  # SPA routing (Vue Router history mode)
+  location / {
+    try_files $uri $uri/ /index.html;
+  }
+
+  # Reverse proxy to backend (strip /api prefix)
+  location /api/ {
+    proxy_pass http://backend:8080/;
+    proxy_http_version 1.1;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+  }
+}
+