fix(copy): Mobile compatibility issues.

src/views/setting/AccountSettingSystem.vue

@@ -200,10 +200,12 @@ async function saveAdvancedSettings() {
 }
 
 // 快捷复制到剪贴板
-function copyValue(value: string) {
+async function copyValue(value: string) {
   try {
-    copyToClipboard(value)
-    $toast.success('已复制到剪贴板')
+    let success
+    success = copyToClipboard(value)
+    if (await success) $toast.success('已复制到剪贴板')
+    else $toast.error(`复制失败：可能是浏览器不支持或被用户阻止!`)
   } catch (error) {
     $toast.error('复制失败！')
     console.log(error)