iot增加屏幕背光亮度调节 (#150)

main/display/lcd_display.h

@@ -31,7 +31,6 @@ protected:
     DisplayFonts fonts_;
 
     void InitializeBacklight(gpio_num_t backlight_pin);
-    void SetBacklight(uint8_t brightness);
 
     virtual void SetupUI();
     virtual bool Lock(int timeout_ms = 0) override;
@@ -47,6 +46,7 @@ public:
     void SetChatMessage(const std::string &role, const std::string &content) override;
     void SetEmotion(const std::string &emotion) override;
     void SetIcon(const char* icon) override;
+    void SetBacklight(uint8_t brightness);
 };
 
 #endif // LCD_DISPLAY_H