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/sensors.h

@@ -0,0 +1,65 @@
+#ifndef SENSORS_H
+#define SENSORS_H
+#include "esp_err.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
+#include "driver/i2c_master.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// 默认 I2C 引脚/参数（如果上层未定义，则使用这些默认值）
+#ifndef I2C_MASTER_SCL_IO
+#define I2C_MASTER_SCL_IO 5
+#endif
+#ifndef I2C_MASTER_SDA_IO
+#define I2C_MASTER_SDA_IO 4
+#endif
+#ifndef I2C_MASTER_NUM
+#define I2C_MASTER_NUM I2C_NUM_0
+#endif
+#ifndef I2C_MASTER_FREQ_HZ
+#define I2C_MASTER_FREQ_HZ 100000
+#endif
+
+// 传感器数据结构体（从 main.c 抽取）
+typedef struct
+{
+	float temperature;
+	float humidity;
+	float lux;
+	uint16_t co2_ppm;
+	uint16_t tvoc_ppb;
+	bool ahtxx_valid;
+	bool bh1750_valid;
+	bool sgp30_valid;
+} sensor_data_t;
+
+// 全局传感器数据（在 sensors.c 定义）
+extern sensor_data_t g_sensor_data;
+
+// 互斥锁（由 main.c 创建，sensors 使用 extern 引用）
+extern SemaphoreHandle_t xSensorDataMutex;
+
+// I2C 句柄（在 sensors.c 中定义）
+extern i2c_master_bus_handle_t bus_handle;
+extern i2c_master_dev_handle_t dev_handle;
+
+// 模块对外接口
+esp_err_t sensors_init(void);
+esp_err_t sensors_read(void);
+
+// 低层接口 / 任务
+esp_err_t i2c_master_init(void);
+void i2c0_ahtxx_task(void *pvParameters);
+void i2c0_bh1750_task(void *pvParameters);
+void i2c0_sgp30_task(void *pvParameters);
+void get_sensor_data(sensor_data_t *data);
+void print_sensor_data(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // SENSORS_H