refactor(vd960Loop): 算法回退到 DLD154V4B，四通道适配

- 用 DLD154V4B vd1_task/per_channel 替换 vds_task 复杂算法
- 移除 FUNCTION_B/二次判断/快速变化/多重确认等增强特性
- 保留平坦性离开算法 (CN200910309382)，每通道独立状态
- 灵敏度表改为 DLD154V4B 4级: {216,108,36,10} / {108,72,18,9}
- 清理废弃类型: FltHistoryManager, Loop_ACS_Info, StageRangeConfig 等
- 首次添加 vd960DBN 完整源码

vd960DBN/SRC/Peripheral/inc/ch32v20x_wwdg.h

@@ -0,0 +1,41 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_wwdg.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the WWDG
+ *                      firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_WWDG_H
+#define __CH32V20x_WWDG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* WWDG_Prescaler */
+#define WWDG_Prescaler_1    ((uint32_t)0x00000000)
+#define WWDG_Prescaler_2    ((uint32_t)0x00000080)
+#define WWDG_Prescaler_4    ((uint32_t)0x00000100)
+#define WWDG_Prescaler_8    ((uint32_t)0x00000180)
+
+void       WWDG_DeInit(void);
+void       WWDG_SetPrescaler(uint32_t WWDG_Prescaler);
+void       WWDG_SetWindowValue(uint8_t WindowValue);
+void       WWDG_EnableIT(void);
+void       WWDG_SetCounter(uint8_t Counter);
+void       WWDG_Enable(uint8_t Counter);
+FlagStatus WWDG_GetFlagStatus(void);
+void       WWDG_ClearFlag(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif