feat: 新增“实践经历”栏目，收录 alin.hu 的全栈入门指南

- 新增 practice docs 实例（路由 /practice）与 sidebarsPractice.ts
- docs/full_guide 迁移至 practice/alin.hu
- 导航栏新增“实践经历”入口
- 修复文档内指向旧 /docs/full_guide 路径的链接

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

packages/stack-idealjs/sidebarsPractice.ts

@@ -0,0 +1,8 @@
+import type {SidebarsConfig} from '@docusaurus/plugin-content-docs';
+
+// 实践经历侧边栏，独立于全栈教程
+const sidebars: SidebarsConfig = {
+  practiceSidebar: [{type: 'autogenerated', dirName: '.'}],
+};
+
+export default sidebars;