fix(admin): nginx.conf 与 deploy 对齐，避免 assets 回退为 HTML MIME 白屏

Made-with: Cursor

admin/Dockerfile

@@ -11,7 +11,7 @@ RUN npm run build
 ARG REGISTRY_MIRROR=docker.m.daocloud.io/library/
 FROM ${REGISTRY_MIRROR}nginx:alpine
 COPY --from=builder /app/dist /usr/share/nginx/html
-# 外层 Nginx 已把 /admin/ 转成 / 转发到本容器，故这里用 location / 提供 SPA（base 为 /admin/ 时静态资源请求为 /assets/...）
-RUN echo 'server { listen 80; root /usr/share/nginx/html; location / { try_files $uri $uri/ /index.html; } }' > /etc/nginx/conf.d/default.conf
+# 与 deploy/admin/default.conf 同逻辑：^~ /assets/ 避免缺失 chunk 时回退到 index.html → MIME text/html 白屏
+COPY nginx.conf /etc/nginx/conf.d/default.conf
 EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]