fix: review 修复——meta 覆盖、重复支付、卸载守卫、测试补全

- EditPost 保存时合并表单中的部分 meta 键，防止插件注入字段覆盖 unlocked_user_ids 等其他键（单篇解锁用户会失去权限的 bug）
- unlockPost：已有阅读权限（会员/作者/已解锁）直接跳文章，不重复支付
- subscribe：已有该套餐有效订阅直接跳我的订阅页
- uninstall：存在已启用的依赖者时拒绝卸载（与 disable 一致）
- .gitignore 排除 storage/media-library/temp 测试残留
- 测试：AdminPagesTest 补 /admin/plugins /admin/payments；新增 Livewire 保存验证 meta 保留、解锁/订阅防重复支付、卸载守卫

tests/Feature/PluginDependencyTest.php

@@ -83,6 +83,21 @@ class PluginDependencyTest extends TestCase
         $this->assertSame(['neatstudio.payment'], $plugins['neatstudio.membership']['dependency_errors']);
     }
 
+    public function test_uninstall_plugin_with_enabled_dependent_throws(): void
+    {
+        $manager = $this->manager();
+
+        try {
+            $manager->uninstall('neatstudio.payment');
+            $this->fail('存在已启用的依赖者时应抛出异常');
+        } catch (RuntimeException $e) {
+            $this->assertStringContainsString('neatstudio.membership', $e->getMessage());
+        }
+
+        // 卸载失败，记录仍在
+        $this->assertTrue($manager->isEnabled('neatstudio.payment'));
+    }
+
     public function test_dependency_problems_for_missing_plugin(): void
     {
         $manager = $this->manager();