chore(openspec): archive add-home-module, refactor-module-menu-source, add-extension-install-ui

- Archive 3 completed changes to changes/archive/
- Update specs: navigation, runtime, module-packaging, shell-layout
- Create new spec: extension-management
- Fix Purpose sections for strict validation (cli-testing, module-template, runtime)

Author: Hongwei-MB

…anges/add-extension-install-ui/design.md …12-17-add-extension-install-ui/design.mdopenspec/changes/add-extension-install-ui/design.md renamed to openspec/changes/archive/2025-12-17-add-extension-install-ui/design.md openspec/changes/add-extension-install-ui/design.md renamed to openspec/changes/archive/2025-12-17-add-extension-install-ui/design.md

@@ -24,6 +24,6 @@
 
 ## 4. 验证
 
-- [ ] 4.1 手动测试：Avalonia 安装 modpkg → 验证加载/卸载/重新加载正常
-- [ ] 4.2 手动测试：Blazor 上传安装 modpkg → 验证同上
-- [ ] 4.3 测试覆盖安装流程
+- [x] 4.1 手动测试：Avalonia 安装 modpkg → 验证加载/卸载/重新加载正常
+- [x] 4.2 手动测试：Blazor 上传安装 modpkg → 验证同上
+- [x] 4.3 测试覆盖安装流程