功能：平台管理员删除商户账号

backend/internal/router/router.go

@@ -195,6 +195,7 @@ func Setup(h *Handlers) *gin.Engine {
 			{
 				admin.GET("/platform/admins", h.User.ListPlatformAdmins)
 				admin.GET("/platform/merchant-accounts", h.User.ListMerchantAccountGroups)
+				admin.DELETE("/platform/merchant-accounts/:id", h.User.DeleteMerchantAccount)
 				admin.POST("/platform/admins", h.User.CreatePlatformAdmin)
 				admin.PATCH("/platform/admins/:id", h.User.UpdatePlatformAdmin)
 				admin.DELETE("/platform/admins/:id", h.User.DeletePlatformAdmin)