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/sys/ota_boot_request.cpp

@@ -217,6 +217,7 @@ void OtaBootRequest::process()
      * BOOT 起机后再由 HELLO role=boot 确认。 */
     /* SysTick 中断仍开，delayMs 可用；SPI 相关 IRQ 已关。 */
     SysTickTimer::delayMs(kRebootDelayMs);
+    /* 复位前最终关中断:必须用 PRIMASK 全屏蔽(非 BASEPRI),确保 NVIC_SystemReset 过程中无任何中断嵌套 */
     __disable_irq();
     NVIC_SystemReset();
     while(1) {