feat(i18n): routing and localization infrastructure (phase 1)

Implement Phase 1 of i18n spec:
- Configure next-intl with 6 locales (pt, en, es, fr, de, zh-CN) and pathnames
- Move routes to app/[locale] structure with localized layouts and metadata
- Add middleware for root language negotiation (307), legacy redirects (308), and 404 for non-pt book
- Implement language selector dropdown in header with cookie persistence
- Add system typography rules for zh-CN and word-break/hyphenation for de/fr

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

app/catalogo/layout.jsx

@@ -1,39 +0,0 @@
-import { paginaMeta, jsonLd } from "@/lib/seo";
-
-export const metadata = paginaMeta({
-	titulo: "Catálogo de placas ESP32",
-	descricao: "Placas de desenvolvimento com ESP32 disponíveis no Brasil, com filtro por série, conector e conversor USB-serial.",
-	caminho: "/catalogo",
-	keywords: ["placas ESP32", "DevKit ESP32", "comprar ESP32", "ESP32 DevKitC"],
-});
-
-export default function Layout({ children }) {
-	return (
-		<>
-			<script
-				type="application/ld+json"
-				dangerouslySetInnerHTML={{
-					__html: JSON.stringify(
-						jsonLd.aplicacaoWeb({
-							nome: "Catálogo de Placas ESP32",
-							descricao: "Guia e catálogo interativo de placas de desenvolvimento e DevKits com microcontroladores ESP32.",
-							caminho: "/catalogo",
-						})
-					),
-				}}
-			/>
-			<script
-				type="application/ld+json"
-				dangerouslySetInnerHTML={{
-					__html: JSON.stringify(
-						jsonLd.trilha([
-							{ nome: "Início", caminho: "/" },
-							{ nome: "Catálogo de Placas", caminho: "/catalogo" },
-						])
-					),
-				}}
-			/>
-			{children}
-		</>
-	);
-}