feat(i18n): Spanish localization (phase 4)

Complete implementation of Spanish (es-419) language support:
- Canonical catalogs and data: messages/es.json, data/es/**, lib/data/es/**, public/exemplos/es/**
- Canonical slugs: /es/series, /es/catalogo, /es/comparacion, /es/componentes, /es/diagnostico, /es/frameworks, /es/glosario, /es/selector, /es/acerca
- Dedicated search index at /api/busca/es with Spanish accent normalization
- Strict exclusion of book references in Spanish routes and catalogs
- Language selector and root negotiation with es active (ENABLED_LOCALES = ['pt', 'en', 'es'])
- Extended verification suite: check-i18n, smoke-imagem and verifica-vazamentos

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

components/LanguageSelector.jsx

@@ -63,7 +63,7 @@ export default function LanguageSelector() {
 				className="flex h-11 min-w-[44px] items-center gap-1.5 rounded-full border border-line bg-surface px-3 text-sm font-semibold text-ink transition-colors hover:bg-surface-2 focus-visible:outline-2 focus-visible:outline-accent"
 				aria-haspopup="listbox"
 				aria-expanded={open}
-				aria-label={currentLocaleCode === "en" ? `Current language: ${currentLocale.label}. Click to switch language.` : `Idioma atual: ${currentLocale.label}. Clique para trocar de idioma.`}
+				aria-label={currentLocaleCode === "en" ? `Current language: ${currentLocale.label}. Click to switch language.` : currentLocaleCode === "es" ? `Idioma actual: ${currentLocale.label}. Haga clic para cambiar de idioma.` : `Idioma atual: ${currentLocale.label}. Clique para trocar de idioma.`}
 				title={currentLocaleCode === "en" ? `Language: ${currentLocale.label}` : `Idioma: ${currentLocale.label}`}
 			>
 				<Globe className="h-4 w-4 text-muted" aria-hidden="true" />
@@ -77,7 +77,7 @@ export default function LanguageSelector() {
 			{open && (
 				<div
 					role="listbox"
-					aria-label={currentLocaleCode === "en" ? "Available languages" : "Idiomas disponíveis"}
+					aria-label={currentLocaleCode === "en" ? "Available languages" : currentLocaleCode === "es" ? "Idiomas disponibles" : "Idiomas disponíveis"}
 					className="absolute right-0 top-full mt-2 w-48 rounded-2xl border border-line bg-surface p-1.5 shadow-[0_24px_60px_-20px_rgba(15,23,42,0.35)] dark:shadow-[0_24px_60px_-20px_rgba(0,0,0,0.8)] z-50"
 				>
 					{LOCALES.map((loc) => {