refactor(js): 复制成功toast文案收敛为toastCopied统一口径

tests/Feature/AdminJsToastCopiedHelperShouldExistTest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminJsToastCopiedHelperShouldExistTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_admin_js_should_include_toast_copied_helper(): void
+    {
+        $js = file_get_contents(public_path('js/admin.js'));
+        $this->assertIsString($js);
+
+        $this->assertStringContainsString('function toastCopied', $js);
+        $this->assertStringContainsString("msg = '已复制'", $js);
+    }
+}