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>

public/exemplos/fr/arduino.ino

@@ -0,0 +1,29 @@
+#include <WiFi.h>
+
+// Remplacez par les identifiants de votre réseau Wi-Fi
+const char* ssid = "NOM_DE_VOTRE_RESEAU";
+const char* password = "MOT_DE_PASSE_RESEAU";
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000);
+  
+  Serial.println("Connexion au Wi-Fi...");
+  WiFi.begin(ssid, password);
+
+  // En attente de la connexion
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  Serial.println("");
+  Serial.println("Wi-Fi connecté avec succès !");
+  Serial.print("Adresse IP : ");
+  Serial.println(WiFi.localIP());
+}
+
+void loop() {
+  // Aqui você pode colocar o código principal do seu programa
+  delay(1000);
+}