feat: utils-showToast 完善函数类型定义，添加重载

src/utils/toast.ts

@@ -18,8 +18,12 @@ interface ToastOptions {
    */
   mask?: boolean
 }
-
-export function showToast(options: ToastOptions | string) {
+/**
+ * 显示 toast
+ */
+export function showToast(message: string): void
+export function showToast(options: ToastOptions): void
+export function showToast(options: ToastOptions | string): void {
   const defaultOptions: ToastOptions = {
     type: 'info',
     duration: 2000,