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/comm/ethercat_slave.cpp

@@ -113,8 +113,9 @@ void EthercatSlave::process()
      * 运行期 PDO 交换仅通过 getLatestInputs()/setOutputs() 三缓冲进行;ESC 寄存器访问仅限 init 阶段。
      *
      * 框架级桥接:从三缓冲取最新输入到 s_appInputs,把 s_appOutputs 推回三缓冲。
-     * TODO: 应用对象字典映射(具体输入字节对应哪个应用变量,如字节 0-3=温度浮点),
-     *       由后续应用层 spec 定义;应用层通过 getApplicationInputs()/setApplicationOutputs() 访问快照。 */
+     * TODO(spec): 应用对象字典映射(具体输入字节对应哪个应用变量,如字节 0-3=温度浮点)
+     *             待后续应用层 spec 定义;
+     *             应用层通过 getApplicationInputs()/setApplicationOutputs() 访问快照。 */
     const PdoBuffer *latest = getLatestInputs();
     if (latest != nullptr) {
         s_appInputs = *latest;