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/watchdog.h

@@ -1,4 +1,4 @@
-/**
+/**
  * @file watchdog.h
  * @brief APP 独立看门狗模块（FWDGT）。
  *
@@ -17,9 +17,6 @@ public:
 
     /** @brief 喂狗（重载计数器），应在主循环中周期调用。 */
     static void feed();
-
-    /** @brief 停止喂狗，让看门狗自然超时触发复位跳转 BOOT。 */
-    static void abandon();
 };
 
 #endif /* DEVICE_WATCHDOG_H */