feat(templates): add Claude Code Templates marketplace

- Add template repository management and component discovery
- Implement template installation for agents, commands, hooks, MCPs, skills, settings
- Support multi-app installation (Claude/Codex/Gemini)
- Add frontend components for browsing and installing templates
- Include i18n translations for zh/en/ja

src/components/ui/button.tsx

@@ -13,7 +13,7 @@ const buttonVariants = cva(
           "bg-blue-500 text-white hover:bg-blue-600 dark:bg-blue-600 dark:hover:bg-blue-700",
         // 危险按钮：红底白字（对应旧版 danger）
         destructive:
-          "bg-red-500 text-white hover:bg-red-600 dark:bg-red-600 dark:hover:bg-red-700",
+          "bg-red-500 text-white hover:bg-red-600 dark:bg-red-500 dark:hover:bg-red-600",
         // 轮廓按钮
         outline:
           "border border-border-default bg-background hover:bg-gray-100 hover:border-border-hover dark:hover:bg-gray-800",