docs(zh-CN): fix remaining cookbook references from practical guide to cookbook

Fix remaining '实战指南' references in VuePress config files:
- navbar/zh-CN.ts navigation configuration
- sidebar/zh-CN.ts sidebar configuration

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jexjws

.vuepress/configs/navbar/zh-CN.ts

@@ -8,7 +8,7 @@ export const navbarZhCN: NavbarConfig = [
     children: [
       { text: 'Nushell 之书', link: '/zh-CN/book/' },
       { text: '命令参考列表', link: '/commands/' },
-      { text: '实战指南', link: '/zh-CN/cookbook/' },
+      { text: '实战宝典', link: '/zh-CN/cookbook/' },
       { text: '语言参考指南', link: '/lang-guide/' },
       { text: '贡献指南', link: '/zh-CN/contributor-book/' },
     ],

.vuepress/configs/sidebar/zh-CN.ts

@@ -144,7 +144,7 @@ export const sidebarZhCN: SidebarConfig = {
   ],
   '/zh-CN/cookbook/': [
     {
-      text: '实战指南',
+      text: '实战宝典',
       collapsible: false,
       children: [
         '/zh-CN/cookbook/README.md',