feat(i18n): English localization (phase 3)

- Translate content to English across messages/en.json, data/en, lib/data/en, and public/exemplos/en
- Implement localized routing, slugs, and language negotiation with fallback to en
- Build dedicated search index for English with strict book exclusion
- Update components and pages to dynamically render localized strings and datasets
- Verify full structural parity and exact 1:1 match on Portuguese pages via comparator

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

public/exemplos/en/arduino.ino

@@ -0,0 +1,29 @@
+#include <WiFi.h>
+
+// Substitua pelos dados da sua rede Wi-Fi
+const char* ssid = "NOME_DA_SUA_REDE";
+const char* password = "SENHA_DA_SUA_REDE";
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000);
+  
+  Serial.println("Conectando ao Wi-Fi...");
+  WiFi.begin(ssid, password);
+
+  // Aguarda a conexão
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  Serial.println("");
+  Serial.println("Wi-Fi conectado com sucesso!");
+  Serial.print("Endereço IP: ");
+  Serial.println(WiFi.localIP());
+}
+
+void loop() {
+  // Aqui você pode colocar o código principal do seu programa
+  delay(1000);
+}