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/usart0.h

@@ -56,14 +56,6 @@ private:
      */
     static uint16_t nextIndex(uint16_t idx);
 
-    /**
-     * @brief 判断环形发送缓冲是否已满。
-     * @param[in]  无。
-     * @param[out] 无。
-     * @retval bool true 表示已满，false 表示可继续写入。
-     */
-    static bool isBufferFull();
-
     /**
      * @brief 判断环形发送缓冲是否为空。
      * @param[in]  无。
@@ -75,7 +67,6 @@ private:
     static bool putCharNonBlocking(int ch);
 
     static constexpr uint16_t kTxBufSize = 1024U;
-    static volatile uint32_t s_dropCount;
     static uint8_t           s_txBuf[kTxBufSize];
     static volatile uint16_t s_txHead;
     static volatile uint16_t s_txTail;