fix(docker): 更新Nginx配置文件路径

- 将nginx.conf复制目标从/etc/nginx/nginx.conf改为/etc/nginx/conf.d/default.conf
- 确保Nginx配置能正确加载默认站点配置
- 保持与Alpine版Nginx的目录结构一致

Dockerfile

@@ -12,7 +12,7 @@ RUN pnpm build
 # --- 第二阶段：Nginx ---
 FROM nginx:alpine
 
-COPY nginx.conf /etc/nginx/nginx.conf
+COPY nginx.conf /etc/nginx/conf.d/default.conf
 
 RUN rm -rf /usr/share/nginx/html/*
 COPY --from=builder /workspace/docs /usr/share/nginx/html