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/de/esp-who.c

@@ -0,0 +1,71 @@
+#include "esp_camera.h"
+#include "fd_forward.h"   // Face Detection
+#include "fr_forward.h"   // Face Recognition
+#include "human_face_detect_msr01.hpp"
+#include "human_face_detect_mnp01.hpp"
+
+#define CAMERA_MODEL_AI_THINKER // ou o modelo da sua placa
+
+#include "camera_pins.h"
+
+void setup() {
+    Serial.begin(115200);
+    Serial.setDebugOutput(true);
+    Serial.println("Iniciando câmera...");
+
+    camera_config_t config;
+    config.ledc_channel = LEDC_CHANNEL_0;
+    config.ledc_timer = LEDC_TIMER_0;
+    config.pin_d0 = Y2_GPIO_NUM;
+    config.pin_d1 = Y3_GPIO_NUM;
+    config.pin_d2 = Y4_GPIO_NUM;
+    config.pin_d3 = Y5_GPIO_NUM;
+    config.pin_d4 = Y6_GPIO_NUM;
+    config.pin_d5 = Y7_GPIO_NUM;
+    config.pin_d6 = Y8_GPIO_NUM;
+    config.pin_d7 = Y9_GPIO_NUM;
+    config.pin_xclk = XCLK_GPIO_NUM;
+    config.pin_pclk = PCLK_GPIO_NUM;
+    config.pin_vsync = VSYNC_GPIO_NUM;
+    config.pin_href = HREF_GPIO_NUM;
+    config.pin_sscb_sda = SIOD_GPIO_NUM;
+    config.pin_sscb_scl = SIOC_GPIO_NUM;
+    config.pin_pwdn = PWDN_GPIO_NUM;
+    config.pin_reset = RESET_GPIO_NUM;
+    config.xclk_freq_hz = 20000000;
+    config.pixel_format = PIXFORMAT_RGB565;
+    config.frame_size = FRAMESIZE_QVGA;
+    config.fb_count = 1;
+
+    if (esp_camera_init(&config) != ESP_OK) {
+        Serial.println("Falha ao iniciar a câmera!");
+        return;
+    }
+
+    Serial.println("Câmera inicializada com sucesso!");
+}
+
+void loop() {
+    camera_fb_t *fb = esp_camera_fb_get();
+    if (!fb) {
+        Serial.println("Falha ao capturar imagem!");
+        return;
+    }
+
+    // Detecta rostos na imagem
+    box_array_t *faces = face_detect_msr01(fb->buf, fb->width, fb->height, fb->format);
+    if (faces) {
+        Serial.printf("Rostos detectados: %d\n", faces->len);
+        for (int i = 0; i < faces->len; i++) {
+            box_t *box = &faces->box[i];
+            Serial.printf("Face %d - x:%d y:%d w:%d h:%d\n", i, box->box_p[0], box->box_p[1],
+                          box->box_p[2] - box->box_p[0], box->box_p[3] - box->box_p[1]);
+        }
+        dl_lib_free(faces);
+    } else {
+        Serial.println("Nenhum rosto detectado.");
+    }
+
+    esp_camera_fb_return(fb);
+    delay(1000);
+}