重构User_code目录结构：将文件组织到子文件夹中

主要更改：
- 将所有BSP外设文件移动到独立子文件夹（can/, fdcan/, uart/等）
- 将所有Component文件移动到独立子文件夹（pid/, filter/, cmd/等）
- 将所有Device文件移动到独立子文件夹（dr16/, bmi088/等）
- 更新代码生成器以支持新的文件夹结构
- 保持向后兼容性，支持从子文件夹或根目录加载模板
- 添加STRUCTURE.md文档说明新的目录结构

优势：
✅ 更好的代码组织和管理
✅ 便于添加、删除、修改模板
✅ 清晰的模块划分
✅ 向后兼容现有结构

assets/User_code/bsp/gpio/gpio.c

@@ -0,0 +1,98 @@
+/* Includes ----------------------------------------------------------------- */
+#include "bsp/gpio.h"
+
+#include <gpio.h>
+#include <main.h>
+
+/* USER INCLUDE BEGIN */
+
+/* USER INCLUDE END */
+
+/* Private define ----------------------------------------------------------- */
+/* USER DEFINE BEGIN */
+
+/* USER DEFINE END */
+
+/* Private macro ------------------------------------------------------------ */
+/* Private typedef ---------------------------------------------------------- */
+typedef struct {
+  uint16_t pin;
+  GPIO_TypeDef *gpio;
+} BSP_GPIO_MAP_t;
+
+/* USER STRUCT BEGIN */
+
+/* USER STRUCT END */
+
+/* Private variables -------------------------------------------------------- */
+static const BSP_GPIO_MAP_t GPIO_Map[BSP_GPIO_NUM] = {
+/* AUTO GENERATED BSP_GPIO_MAP */
+};
+
+static void (*GPIO_Callback[16])(void);
+
+/* Private function  -------------------------------------------------------- */
+/* USER FUNCTION BEGIN */
+
+/* USER FUNCTION END */
+
+void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) {
+  for (uint8_t i = 0; i < 16; i++) {
+    if (GPIO_Pin & (1 << i)) {
+      if (GPIO_Callback[i]) {
+        GPIO_Callback[i]();
+      }
+    }
+  }
+}
+
+/* Exported functions ------------------------------------------------------- */
+int8_t BSP_GPIO_RegisterCallback(BSP_GPIO_t gpio, void (*callback)(void)) {
+  if (callback == NULL) return BSP_ERR_NULL;
+  if (gpio >= BSP_GPIO_NUM) return BSP_ERR;
+
+  // 从GPIO映射中获取对应的pin值
+  uint16_t pin = GPIO_Map[gpio].pin;
+  
+  for (uint8_t i = 0; i < 16; i++) {
+    if (pin & (1 << i)) {
+      GPIO_Callback[i] = callback;
+      break;
+    }
+  }
+  return BSP_OK;
+}
+
+int8_t BSP_GPIO_EnableIRQ(BSP_GPIO_t gpio) {
+  switch (gpio) {
+/* AUTO GENERATED BSP_GPIO_ENABLE_IRQ */
+    default:
+      return BSP_ERR;
+  }
+  return BSP_OK;
+}
+
+int8_t BSP_GPIO_DisableIRQ(BSP_GPIO_t gpio) {
+  switch (gpio) {
+/* AUTO GENERATED BSP_GPIO_DISABLE_IRQ */
+    default:
+      return BSP_ERR;
+  }
+  return BSP_OK;
+}
+int8_t BSP_GPIO_WritePin(BSP_GPIO_t gpio, bool value){
+  if (gpio >= BSP_GPIO_NUM) return BSP_ERR;
+  HAL_GPIO_WritePin(GPIO_Map[gpio].gpio, GPIO_Map[gpio].pin, value);
+  return BSP_OK;
+}
+
+int8_t BSP_GPIO_TogglePin(BSP_GPIO_t gpio){
+  if (gpio >= BSP_GPIO_NUM) return BSP_ERR;
+  HAL_GPIO_TogglePin(GPIO_Map[gpio].gpio, GPIO_Map[gpio].pin);
+  return BSP_OK;
+}
+
+bool BSP_GPIO_ReadPin(BSP_GPIO_t gpio){
+  if (gpio >= BSP_GPIO_NUM) return false;
+  return HAL_GPIO_ReadPin(GPIO_Map[gpio].gpio, GPIO_Map[gpio].pin) == GPIO_PIN_SET;
+}