feat(i18n): restrict public routes and metadata to enabled locales

- Add ENABLED_LOCALES configuration in i18n/links.js (currently ["pt"])
- Redirect inactive locale prefixes to /pt via 307 in middleware.js
- Restrict root locale negotiation to active locales with fallback to pt
- Hide LanguageSelector when only one locale is enabled
- Generate sitemap, hreflang alternates, and og:locale only for active locales
- Generate static SSG pages only for active locales in build
- Adapt check:i18n and smoke-imagem.sh to validate active vs inactive locales

Co-Authored-By: Antigravity <noreply@google.com>

i18n/links.js

@@ -3,15 +3,23 @@
  * Módulo puro (sem 'use client') seguro para Server e Client Components.
  */
 
-export const LOCALES = [
-	{ code: "pt", label: "Português", short: "PT", lang: "pt-BR" },
-	{ code: "en", label: "English", short: "EN", lang: "en" },
-	{ code: "es", label: "Español", short: "ES", lang: "es-419" },
-	{ code: "fr", label: "Français", short: "FR", lang: "fr" },
-	{ code: "de", label: "Deutsch", short: "DE", lang: "de" },
-	{ code: "zh-CN", label: "简体中文", short: "中", lang: "zh-CN" },
+// Ponto único de configuração de idiomas ATIVOS.
+// Para ativar um novo idioma no site, basta adicionar seu código aqui (ex.: ["pt", "en"]).
+export const ENABLED_LOCALES = ["pt"];
+
+export const ALL_LOCALES = [
+	{ code: "pt", label: "Português", short: "PT", lang: "pt-BR", og: "pt_BR" },
+	{ code: "en", label: "English", short: "EN", lang: "en", og: "en_US" },
+	{ code: "es", label: "Español", short: "ES", lang: "es-419", og: "es_419" },
+	{ code: "fr", label: "Français", short: "FR", lang: "fr", og: "fr_FR" },
+	{ code: "de", label: "Deutsch", short: "DE", lang: "de", og: "de_DE" },
+	{ code: "zh-CN", label: "简体中文", short: "中", lang: "zh-CN", og: "zh_CN" },
 ];
 
+export const ALL_LOCALE_CODES = ALL_LOCALES.map((l) => l.code);
+
+export const LOCALES = ALL_LOCALES.filter((l) => ENABLED_LOCALES.includes(l.code));
+
 export const CANONICAL_ROUTES = [
 	{
 		id: "series_item",
@@ -127,3 +135,15 @@ export function getLocalizedHref(pathname, targetLocale) {
 	}
 	return `/${targetLocale}/`;
 }
+
+export function getPtPath(pathname) {
+	if (!pathname || pathname === "/" || pathname === "/pt" || pathname === "/pt/") return "/pt";
+	for (const route of CANONICAL_ROUTES) {
+		const m = pathname.match(route.match);
+		if (m) {
+			const slug = route.getSlug("pt", m[1]);
+			return slug ? `/pt${slug}` : "/pt";
+		}
+	}
+	return "/pt";
+}