refactor: 外链中转拆为内置插件 neatstudio.link-tracker

- 插件承载全部逻辑：redirects 迁移（hasTable 兼容旧库）、Redirect 模型、UrlRedirector、/go 路由+控制器、Filament 外链中转资源
- 核心只留 hook 接入点：
  - tracked_url() 助手走 link.redirect 过滤器（评论正文/作者网址/友链模板统一调用）
  - 正文外链改写移到插件的 post.rendered 过滤器（优先级 20，晚于会员付费过滤）
- 停用插件：链接恢复直连、内容不受影响；后台「管理 → 外链中转」查看点击量/启停
- 测试更新为插件上下文（含无过滤器降级断言）；97 通过

tests/Feature/GoRedirectTest.php

@@ -5,25 +5,31 @@ declare(strict_types=1);
 namespace Tests\Feature;
 
 use App\Blog\Services\PostContentRenderer;
-use App\Blog\Services\UrlRedirector;
 use App\Models\Post;
-use App\Models\Redirect;
 use Illuminate\Foundation\Testing\RefreshDatabase;
+use Plugins\Neatstudio\LinkTracker\Models\Redirect;
 use Tests\TestCase;
 
 class GoRedirectTest extends TestCase
 {
     use RefreshDatabase;
 
-    public function test_go_url_rewrites_external_but_keeps_internal(): void
+    public function test_tracked_url_rewrites_external_but_keeps_internal(): void
     {
-        $go = app(UrlRedirector::class);
+        // 外链中转插件默认启用，link.redirect 过滤器生效
+        $this->assertStringContainsString('/go/', tracked_url('https://example.com/path'));
+        $this->assertSame('http://laralog.test/posts/1', tracked_url('http://laralog.test/posts/1'));
+        $this->assertSame('/posts/1', tracked_url('/posts/1'));
+        $this->assertSame('mailto:a@b.com', tracked_url('mailto:a@b.com'));
+        $this->assertSame('#anchor', tracked_url('#anchor'));
+    }
 
-        $this->assertStringContainsString('/go/', $go->goUrl('https://example.com/path'));
-        $this->assertSame('http://laralog.test/posts/1', $go->goUrl('http://laralog.test/posts/1'));
-        $this->assertSame('/posts/1', $go->goUrl('/posts/1'));
-        $this->assertSame('mailto:a@b.com', $go->goUrl('mailto:a@b.com'));
-        $this->assertSame('#anchor', $go->goUrl('#anchor'));
+    public function test_tracked_url_returns_original_without_plugin_filter(): void
+    {
+        // 无插件注册 link.redirect 过滤器时（插件停用/未装），核心视图原样返回外链
+        $manager = new \App\Blog\Support\PluginManager();
+
+        $this->assertSame('https://example.com/path', $manager->applyFilters('link.redirect', 'https://example.com/path'));
     }
 
     public function test_go_redirect_counts_clicks(): void
@@ -54,8 +60,8 @@ class GoRedirectTest extends TestCase
 
     public function test_same_url_reuses_same_hash(): void
     {
-        $a = app(UrlRedirector::class)->goUrl('https://example.com/dup');
-        $b = app(UrlRedirector::class)->goUrl('https://example.com/dup');
+        $a = tracked_url('https://example.com/dup');
+        $b = tracked_url('https://example.com/dup');
 
         $this->assertSame($a, $b);
         $this->assertSame(1, Redirect::query()->where('target_url', 'https://example.com/dup')->count());