feat: public API, SEO and existing surfaces

api/handlers/site/sitemapHandler.go

@@ -37,6 +37,7 @@ type sitemapItem struct {
 	URL        string `json:"url"`
 	ModifiedAt string `json:"modified_at"`
 	Noindex    bool   `json:"noindex"`
+	Lang       string `json:"lang"`
 }
 
 func sitemapIntParam(values url.Values, name string, fallback int) (int, error) {
@@ -73,7 +74,7 @@ func (h *SitemapHandler) Sitemap(w http.ResponseWriter, r *http.Request) {
 
 	items := make([]sitemapItem, 0, len(page.Entries))
 	for _, entry := range page.Entries {
-		items = append(items, sitemapItem{URL: entry.URL, ModifiedAt: entry.ModifiedAt.UTC().Format(time.RFC3339), Noindex: entry.Noindex})
+		items = append(items, sitemapItem{URL: entry.URL, ModifiedAt: entry.ModifiedAt.UTC().Format(time.RFC3339), Noindex: entry.Noindex, Lang: entry.Lang})
 	}
 	body, err := json.Marshal(items)
 	if err != nil {