Refactor and clean up codebase

- Removed unused constants and type aliases in app_spi_command_defs.h and temp_sensor.h.
- Simplified ISpiCommandHandler destructor to default.
- Eliminated redundant methods and comments in temp_sensor and usart0 files.
- Consolidated writeU32Le function to app_spi_command_defs.h for reuse.
- Updated comments for clarity and accuracy in task_manager.h and task_runner.cpp.
- Removed hardfault.h as it contained no declarations.
- Cleaned up CANFD and watchdog implementations by removing dead code and unnecessary comments.
- Updated version numbers in config.h to reflect recent changes.
- Enhanced error handling and diagnostics in hardfault handling.

GD32E508_DCU_APP/device/ADC.cpp

@@ -10,6 +10,7 @@
 #include <math.h>
 
 namespace {
+/* ---- 校验常量与辅助函数 ---- */
 constexpr float kMinValidVdda = 2.7f;
 constexpr float kMaxValidVdda = 3.6f;
 constexpr float kMinValidTemperature = -40.0f;
@@ -24,16 +25,14 @@ static bool isFiniteFloat(float value)
 {
     return isfinite(value) != 0;
 }
-} // namespace
 
-namespace {
+/* ---- DMA 配置 ---- */
 constexpr uint32_t kDmaPeriph = DMA0;
 constexpr dma_channel_enum kDmaChannel = DMA_CH0;
 constexpr uint32_t kChannelCount = 3U;
 constexpr uint32_t kVinGpio = GPIOA;
 constexpr uint32_t kVinPin = GPIO_PIN_6;
 volatile uint16_t s_dmaBuffer[kChannelCount] = {0U, 0U, 0U};
-volatile uint8_t s_dmaReady = 0U;
 } // namespace
 
 /**
@@ -108,30 +107,6 @@ void Adc::init()
     SysTickTimer::delayMs(CONFIG_ADC_STABILIZE_DELAY_MS);
     adc_software_trigger_enable(CONFIG_ADC_INSTANCE, ADC_REGULAR_CHANNEL);
     SysTickTimer::delayMs(1U);
-    s_dmaReady = 1U;
-}
-
-/**
- * @brief 查询 ADC DMA 采样是否已经就绪。
- * @param[in]  无。
- * @param[out] 无。
- * @retval bool true 表示 DMA 已启动并完成初始稳定等待，false 表示尚未就绪。
- */
-bool Adc::dmaReady()
-{
-    return s_dmaReady != 0U;
-}
-
-/**
- * @brief 获取 ADC DMA 原始缓冲区首地址。
- * @param[in]  无。
- * @param[out] 无。
- * @retval const uint16_t* 返回 DMA 原始缓冲区首地址。
- * @note      缓冲顺序固定为 `VIN_ADC / TEMP / VREFINT`。
- */
-const uint16_t *Adc::dmaBuffer()
-{
-    return (const uint16_t *)s_dmaBuffer;
 }
 
 /**