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

main/app_state.h

@@ -0,0 +1,35 @@
+#ifndef APP_STATE_H
+#define APP_STATE_H
+
+#include "common.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern SemaphoreHandle_t xSensorDataMutex;
+extern SemaphoreHandle_t xMqttMessageMutex;
+extern SemaphoreHandle_t xTimePeriodMutex;
+extern SemaphoreHandle_t xControlFlagMutex;
+
+extern bool servo_control_flag;
+extern bool fan_control_flag;
+extern bool buzzer_control_flag;
+extern bool light_source_control_flag;
+extern uint8_t led_brightness_value;
+extern bool led_backlight_on;
+
+extern device_message_t g_device_message;
+extern float g_temperature_threshold;
+extern bool g_cooling_mode_enabled;
+extern bool g_high_temp_alerted;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // APP_STATE_H