refactor(display): migrate from ST7735S to ST7789 driver

- Rename component directory from lvgl_st7735s_use to lvgl_st7789_use
- Update CMakeLists.txt to register new source files
- Add comprehensive README documentation for ST7789 configuration
- Add time_alarm module with SNTP synchronization and alarm management
- Add sensors header for sensor abstraction layer

components/serial_mcu/include/serial_mcu.h

@@ -1,2 +1,15 @@
+#ifndef SERIAL_MCU_H
+#define SERIAL_MCU_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void serial_mcu_init(void); // 初始化串口
-int sendControlFrame(uint8_t cmd, uint8_t data); // 发送控制帧
+int sendControlFrame(uint8_t cmd, uint8_t data); // 发送控制帧
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // SERIAL_MCU_H