Add ESP32-S3 camera component selection and support (#1670)

Introduces a new esp32s3_camera implementation for ESP32-S3 boards using the esp_camera component, with conditional compilation and Kconfig options to select between esp_camera and esp_video. Updates board initialization code and config files to use the new camera class where appropriate, and adjusts build system and dependencies to support both camera components on ESP32-S3 and ESP32-P4 targets.

main/boards/common/esp32s3_camera.h

@@ -0,0 +1,53 @@
+#pragma once
+#include "sdkconfig.h"
+
+// esp32s3_camera (使用 esp_camera 组件) 仅用于 ESP32-S3 且选择使用 esp_camera 时
+#if defined(CONFIG_IDF_TARGET_ESP32S3) && defined(CONFIG_XIAOZHI_USE_ESP_CAMERA)
+
+#include <lvgl.h>
+#include <thread>
+#include <memory>
+#include <vector>
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/queue.h>
+
+#include "camera.h"
+#include "esp_camera.h"
+
+struct JpegChunk
+{
+    uint8_t *data;
+    size_t len;
+};
+
+class Esp32S3Camera : public Camera
+{
+private:
+    struct FrameBuffer
+    {
+        uint8_t *data = nullptr;
+        size_t len = 0;
+        uint16_t width = 0;
+        uint16_t height = 0;
+        pixformat_t format = PIXFORMAT_RGB565;
+    } frame_;
+
+    bool streaming_on_ = false;
+    std::string explain_url_;
+    std::string explain_token_;
+    std::thread encoder_thread_;
+    camera_fb_t *current_fb_ = nullptr;
+
+public:
+    Esp32S3Camera(const camera_config_t &config);
+    ~Esp32S3Camera();
+
+    virtual void SetExplainUrl(const std::string &url, const std::string &token) override;
+    virtual bool Capture() override;
+    virtual bool SetHMirror(bool enabled) override;
+    virtual bool SetVFlip(bool enabled) override;
+    virtual std::string Explain(const std::string &question) override;
+};
+
+#endif // CONFIG_IDF_TARGET_ESP32S3 && CONFIG_XIAOZHI_USE_ESP_CAMERA