refactor(admin): success flash payload提炼AdminFlash::success并复用

tests/Unit/AdminFlashSuccessPayloadTest.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Support\AdminFlash;
+use PHPUnit\Framework\TestCase;
+
+class AdminFlashSuccessPayloadTest extends TestCase
+{
+    public function test_success_should_return_message_only_when_no_link(): void
+    {
+        $p = AdminFlash::success('ok');
+
+        $this->assertSame('ok', (string) ($p['success'] ?? ''));
+        $this->assertArrayNotHasKey('success_link_href', $p);
+    }
+
+    public function test_success_should_include_link_when_href_present(): void
+    {
+        $p = AdminFlash::success('ok', '/admin/x', '查看');
+
+        $this->assertSame('ok', (string) ($p['success'] ?? ''));
+        $this->assertSame('/admin/x', (string) ($p['success_link_href'] ?? ''));
+        $this->assertSame('查看', (string) ($p['success_link_label'] ?? ''));
+    }
+}