feat(docs): generate sitemap for docs site (#148)

* docs: add VidBee Docs suffix to all documentation page titles

Update the page title metadata generation to append "| VidBee Docs" to all documentation page titles for consistent branding across the site.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

* docs: add canonical URLs to documentation pages

Add canonical URL metadata to all documentation pages to prevent search engine duplication issues and improve SEO rankings.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

* feat(docs): add automatic sitemap

* fix(docs): align canonical base URL

* fix(docs): configure sitemap for static export

Add 'export const dynamic = "force-static"' to sitemap.ts to enable
static generation when using Next.js output: export mode. This fixes
the build error: "export const dynamic = 'force-static'/export const
revalidate not configured on route '/sitemap.xml'".

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* chore(docs): add favicon and icon assets

Add favicons and app icons in various sizes for better browser
and platform support.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>

docs/src/app/[lang]/(docs)/[[...slug]]/page.tsx

@@ -57,11 +57,17 @@ export async function generateMetadata(
   const page = source.getPage(params.slug, params.lang);
   if (!page) notFound();
 
+  const baseUrl = 'https://docs.vidbee.org';
+  const canonicalUrl = `${baseUrl}${page.url}`;
+
   return {
-    title: page.data.title,
+    title: `${page.data.title} | VidBee Docs`,
     description: page.data.description,
     openGraph: {
       images: getPageImage(page).url,
     },
+    alternates: {
+      canonical: canonicalUrl,
+    },
   };
 }

docs/src/app/sitemap.ts

@@ -0,0 +1,34 @@
+import type { MetadataRoute } from 'next';
+import { i18n } from '@/lib/i18n';
+import { source } from '@/lib/source';
+
+export const dynamic = 'force-static';
+
+const baseUrl = 'https://docs.vidbee.org';
+
+function buildPath(segments: string[]): string {
+  if (segments.length === 0) {
+    return '/';
+  }
+  return `/${segments.join('/')}/`;
+}
+
+export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
+  const params = source.generateParams();
+
+  return params.map(({ lang, slug }) => {
+    const segments: string[] = [];
+
+    if (lang && lang !== i18n.defaultLanguage) {
+      segments.push(lang);
+    }
+
+    if (slug && slug.length > 0) {
+      segments.push(...slug);
+    }
+
+    return {
+      url: `${baseUrl}${buildPath(segments)}`,
+    };
+  });
+}