init: UserBaseFront (frontend)

docker/Dockerfile

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+# UserBase 前端静态镜像（基于已构建好的 dist/prod）
+# 构建上下文 = front 目录： docker build -f docker/Dockerfile -t <img> .
+# 说明：caddy 用 handle_path /userbase/* 剥掉前缀后转发进来，故 nginx 直接以 / 提供服务
+FROM nginx:1.27-alpine
+
+RUN rm -rf /usr/share/nginx/html/*
+COPY dist/prod/ /usr/share/nginx/html/
+COPY docker/nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80

docker/nginx.conf

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+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_min_length 1k;
+    gzip_comp_level 5;
+    gzip_types text/plain text/css application/javascript application/json image/svg+xml;
+
+    # hash 路由，所有非静态资源请求回落到 index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location ~* \.(js|css|png|jpe?g|gif|svg|woff2?|ttf|eot)$ {
+        expires 7d;
+        add_header Cache-Control "public, max-age=604800";
+    }
+
+    location = /index.html {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+    }
+}