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/canfd.h

@@ -132,7 +132,6 @@ public:
     /** @brief 查询当前 CANFD 接收过滤模式。 */
     static Mode mode();
 
-    static void poll();
     static bool hasRxFrame();
     static bool consumeRxFrame(uint32_t *id, uint8_t *data, uint8_t *length, uint8_t *channel = nullptr);
     static CanTxResult transmitFrame(uint8_t channelIndex, uint32_t ext_id,
@@ -152,13 +151,6 @@ public:
      */
     static void refreshFeedbackSnapshot();
 
-    /**
-     * @brief 保留的手动 BUS_OFF 恢复诊断入口。
-     * @note  正常周期任务不调用；控制器已启用硬件自动 BUS_OFF 恢复，避免在
-     *        发送重试期间切换收发器 S 脚而人为制造额外位错误。
-     */
-    static void recoverBusOffIfNeeded();
-
     /**
      * @brief 拷贝指定通道的最新反馈快照到调用方缓冲。
      * @param[in]  channelIndex 目标 CAN 通道号（0/1/2）。
@@ -175,9 +167,6 @@ public:
      */
     static bool copyIdSnapshotTable(uint8_t channelIndex, IdSnapshotTable *out);
 
-    static void setNormalMode();
-    static void setSilentMode();
-    static void onRx0Interrupt();
     static void handleRxInterrupt(uint8_t channelIndex);
     static void handleTxInterrupt(uint8_t channelIndex);
 
@@ -209,6 +198,15 @@ private:
     static bool initNominalTiming(uint32_t canPeriph);
     static bool initFdMode(uint32_t canPeriph);
 
+    static void printClockInfo();
+    static void initChannelHardware(uint8_t i);
+    static void configureAllFilters();
+    static void printInitResult();
+    static void printErrorState();
+    static void runSelfTest();
+    static void runLoopbackTest();
+    static void dumpRegisters();
+
     static Diag             s_diag;
     static RxQueue          s_rxQueues[3];
     static uint8_t          s_nextConsumeChannel;
@@ -219,6 +217,4 @@ private:
     static IdSnapshotTable  s_idSnapshot[3];
 };
 
-using canfd_diag_t           = CanFd::Diag;
-
 #endif /* DEVICE_CANFD_H */