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/pwm/pwm.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ----------------------------------------------------------------- */
+#include <stdint.h>
+#include "tim.h"
+#include "bsp.h"
+
+/* USER INCLUDE BEGIN */
+
+/* USER INCLUDE END */
+
+
+/* Exported constants ------------------------------------------------------- */
+/* Exported macro ----------------------------------------------------------- */
+/* USER DEFINE BEGIN */
+
+/* USER DEFINE END */
+
+/* Exported types ----------------------------------------------------------- */
+/* PWM通道 */
+typedef enum {
+/* AUTO GENERATED BSP_PWM_ENUM */
+  BSP_PWM_NUM,
+  BSP_PWM_ERR,
+} BSP_PWM_Channel_t;
+
+/* Exported functions prototypes -------------------------------------------- */
+int8_t BSP_PWM_Start(BSP_PWM_Channel_t ch);
+int8_t BSP_PWM_SetComp(BSP_PWM_Channel_t ch, float duty_cycle);
+int8_t BSP_PWM_SetFreq(BSP_PWM_Channel_t ch, float freq);
+int8_t BSP_PWM_Stop(BSP_PWM_Channel_t ch);
+uint32_t BSP_PWM_GetAutoReloadPreload(BSP_PWM_Channel_t ch);
+uint16_t BSP_PWM_GetChannel(BSP_PWM_Channel_t ch);
+TIM_HandleTypeDef* BSP_PWM_GetHandle(BSP_PWM_Channel_t ch);
+int8_t BSP_PWM_Start_DMA(BSP_PWM_Channel_t ch, uint32_t *pData, uint16_t Length);
+int8_t BSP_PWM_Stop_DMA(BSP_PWM_Channel_t ch);
+
+/* USER FUNCTION BEGIN */
+
+/* USER FUNCTION END */
+
+#ifdef __cplusplus
+}
+#endif