feat(i18n): French and German localization (phase 5)

- Add full message catalogs and content for French (fr) and German (de)
- Implement ASCII canonical slugs for French and German routes
- Add language-specific search endpoints (/api/busca/fr, /api/busca/de)
- Configure strict 404 responses for /fr/livro and /de/livro
- Localize SEO, OpenGraph (fr_FR, de_DE), Twitter and JSON-LD schemas
- Add localized code example comments across 14 examples for fr and de
- Enable 'fr' and 'de' in ENABLED_LOCALES with root negotiation and redirect
- Extend test suite in check-i18n, smoke-imagem and verifica-vazamentos

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

components/SeriesTabMenu.jsx

@@ -2,9 +2,11 @@
 
 import { useEffect, useRef, useState } from "react";
 
-export default function SeriesTabMenu({ tabs, isEn = false, isEs = false, locale }) {
+export default function SeriesTabMenu({ tabs, isEn = false, isEs = false, isFr = false, isDe = false, locale }) {
 	const effectiveIsEn = isEn || locale === "en";
 	const effectiveIsEs = isEs || locale === "es";
+	const effectiveIsFr = isFr || locale === "fr";
+	const effectiveIsDe = isDe || locale === "de";
 	const availableTabs = tabs.filter((tab) => tab.available);
 	const [activeTab, setActiveTab] = useState(availableTabs[0]?.id);
 	const refs = useRef({});
@@ -61,7 +63,21 @@ export default function SeriesTabMenu({ tabs, isEn = false, isEs = false, locale
 
 	return (
 		<div id="diagrama-abas" className="scroll-mt-28">
-			<div role="tablist" aria-label={effectiveIsEn ? "Board and diagram" : effectiveIsEs ? "Placa y diagrama" : "Placa e diagrama"} className="no-scrollbar flex gap-2 overflow-x-auto pb-1">
+			<div
+				role="tablist"
+				aria-label={
+					effectiveIsEn
+						? "Board and diagram"
+						: effectiveIsEs
+						? "Placa y diagrama"
+						: effectiveIsFr
+						? "Carte et schéma"
+						: effectiveIsDe
+						? "Board und Diagramm"
+						: "Placa e diagrama"
+				}
+				className="no-scrollbar flex gap-2 overflow-x-auto pb-1"
+			>
 				{availableTabs.map((tab, indice) => (
 					<button
 						key={tab.id}