feat(docs): enhance documentation site with internationalization and layout updates

- Updated the demo API to support locale-based content rendering.
- Refactored the main layout to accommodate language-specific metadata and routing.
- Introduced new components for blog and documentation pages, ensuring proper language handling.
- Added styles for improved UI consistency across different sections.
- Removed deprecated layout files and streamlined the structure for better maintainability.

apps/docs/app/global.css

@@ -14,3 +14,27 @@ html > body[data-scroll-locked] {
   margin-right: 0 !important;
   --removed-body-scroll-bar-size: 0px !important;
 }
+
+/* 文档页目录：隐藏默认折线，改用单条直线导轨 */
+#nd-toc a[href^='#'] > svg,
+#nd-toc div.absolute:has(> svg) {
+  display: none;
+}
+
+#nd-toc a[href^='#'] {
+  border-inline-start: 1px solid var(--color-fd-border);
+}
+
+#nd-toc a[href^='#'][data-active='true'] {
+  border-inline-start-color: var(--color-fd-primary);
+}
+
+/* 首页导航：通铺整行、无背景无分隔线 */
+.home-fullbleed-nav {
+  --fd-layout-width: 100%;
+}
+
+.home-fullbleed-nav #nd-nav > * {
+  border-bottom-color: transparent;
+  backdrop-filter: none;
+}