refactor: restructure docs for i18n support

- Move existing documentation to docs/zh-cn/
- Initialize structure for multiple languages (ar-sa, de-de, en-us, etc.)
- Add update_readmes.cjs utility script
- Update deployment documentation

docs/.vitepress/theme/style.css

@@ -206,3 +206,29 @@
     white-space: nowrap;
   }
 }
+
+/* 移除链接下划线，改善阅读体验 */
+.vp-doc a {
+  text-decoration: none !important;
+  border-bottom: 1px solid transparent;
+  transition: border-bottom-color 0.2s ease-in-out;
+}
+
+.vp-doc a:hover {
+  border-bottom-color: var(--vp-c-brand-1, #646cff);
+}
+
+/* 链接保持无下划线，只在悬停时显示 */
+.VPDoc a,
+.VPLink a {
+  text-decoration: none !important;
+}
+
+/* 侧边栏链接无下划线 */
+.VPSidebarItem .VPLink {
+  text-decoration: none !important;
+}
+
+.VPSidebarItem .VPLink:hover {
+  text-decoration: none !important;
+}