fix: improve boot fault visibility and defer watchdog start

Core/Src/iwdg.c

@@ -27,7 +27,7 @@
 IWDG_HandleTypeDef hiwdg;
 
 /* IWDG init function */
-void MX_IWDG_Init(void)
+HAL_StatusTypeDef MX_IWDG_Init(void)
 {
 
   /* USER CODE BEGIN IWDG_Init 0 */
@@ -42,12 +42,12 @@ void MX_IWDG_Init(void)
   hiwdg.Init.Reload = 4095;
   if (HAL_IWDG_Init(&hiwdg) != HAL_OK)
   {
-    Error_Handler();
+    return HAL_ERROR;
   }
   /* USER CODE BEGIN IWDG_Init 2 */
 
   /* USER CODE END IWDG_Init 2 */
-
+  return HAL_OK;
 }
 
 /* USER CODE BEGIN 1 */