📦 build(docker): update base image to bookworm version

- change base image from node:20.19.4 to node:20.19.4-bookworm for newer Debian version
- maintain existing Tsinghua University mirror source configuration

Dockerfile

@@ -1,5 +1,5 @@
 # 使用指定基础镜像
-FROM docker.1ms.run/node:20.19.4
+FROM docker.1ms.run/node:20.19.4-bookworm
 
 # 设置软件源为清华大学镜像源
 # 替换 Debian 源为清华镜像（覆盖整个 sources.list 文件）