feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

tests/Paca.Tests/Infrastructure/AppScenarioPipeline.cs

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+using System.Collections.ObjectModel;
+using System.IO;
+using Paca.App.Browser.Features;
+using Paca.App.Core;
+using Paca.App.ViewModels;
+using Paca.Browser;
+using Paca.Browser.Tabs;
+using Paca.Core.Config;
+using Paca.Core.Detection;
+
+namespace Paca.Tests.Infrastructure;
+
+/// <summary>
+/// 19차 핵심 시나리오 파이프라인 프레임워크:
+/// 다운로드 엔진, 탭 세션, 재생목록, 미디어 감지 파이프라인의 종단간 생명주기를
+/// Fluent DSL로 간결하고 강력하게 테스트할 수 있는 프레임워크.
+/// </summary>
+public sealed class AppScenarioPipeline : IDisposable
+{
+    public string TempDir { get; }
+    public AppConfig Config { get; }
+    public DownloadManager DownloadManager { get; }
+    public MediaPlaylist Playlist { get; }
+    public TabManager TabManager { get; }
+    public List<DownloadItemViewModel> DetectedItems { get; } = new();
+
+    private AppScenarioPipeline()
+    {
+        TempDir = Path.Combine(Path.GetTempPath(), "VD_Test_" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(TempDir);
+        Environment.SetEnvironmentVariable("VD_DATA_DIR", TempDir);
+
+        Config = new AppConfig
+        {
+            OutputFolder = Path.Combine(TempDir, "downloads"),
+            RestoreSession = true,
+            PlaylistLoopMode = "all"
+        };
+        Directory.CreateDirectory(Config.OutputFolder);
+
+        DownloadManager = new DownloadManager(
+            Config,
+            _ => Task.FromResult(new List<Microsoft.Web.WebView2.Core.CoreWebView2Cookie>()),
+            _ => { });
+
+        DownloadManager.ItemDetected += item => DetectedItems.Add(item);
+
+        Playlist = new MediaPlaylist();
+        TabManager = new TabManager(() => new TabItem(), _ => { });
+    }
+
+    public static AppScenarioPipeline Create() => new();
+
+    public AppScenarioPipeline SimulateMediaDetection(string url, MediaKind kind, string? pageUrl = null)
+    {
+        DownloadManager.OnDetected(new DetectionContext(url, pageUrl ?? "https://test.local", kind));
+        return this;
+    }
+
+    public AppScenarioPipeline AddPlaylistTrack(string url, string title, string kind)
+    {
+        Playlist.Add(new MediaTrack(url, title, kind, DateTime.UtcNow));
+        return this;
+    }
+
+    public AppScenarioPipeline SimulateNextTrack()
+    {
+        Playlist.Next();
+        return this;
+    }
+
+    public AppScenarioPipeline SimulateTrackPlayed(MediaTrack track)
+    {
+        Playlist.MarkPlayed(track);
+        return this;
+    }
+
+    public AppScenarioPipeline OpenTab(string url)
+    {
+        TabManager.NewTab(url);
+        return this;
+    }
+
+    public SessionSnapshot SaveSession() => TabManager.CaptureSession();
+
+    public AppScenarioPipeline RestoreSession(SessionSnapshot snapshot)
+    {
+        TabManager.RestoreSession(snapshot);
+        return this;
+    }
+
+    public void AssertQueueCount(int count)
+    {
+        Xunit.Assert.Equal(count, DownloadManager.Items.Count);
+    }
+
+    public void AssertDetectedCount(int count)
+    {
+        Xunit.Assert.Equal(count, DetectedItems.Count);
+    }
+
+    public AppScenarioPipeline SetScheduleGate(Func<bool> gate)
+    {
+        DownloadManager.DownloadGate = gate;
+        return this;
+    }
+
+    public AppScenarioPipeline SelectItems(Func<DownloadItemViewModel, bool> predicate)
+    {
+        foreach (var item in DownloadManager.Items)
+        {
+            item.IsSelected = predicate(item);
+        }
+        return this;
+    }
+
+    public AppScenarioPipeline BatchPause()
+    {
+        foreach (var item in DownloadManager.Items.Where(i => i.IsSelected).ToList())
+        {
+            DownloadManager.Pause(item);
+        }
+        return this;
+    }
+
+    public AppScenarioPipeline BatchResume()
+    {
+        foreach (var item in DownloadManager.Items.Where(i => i.IsSelected).ToList())
+        {
+            DownloadManager.Resume(item);
+        }
+        return this;
+    }
+
+    public AppScenarioPipeline BatchCancel()
+    {
+        foreach (var item in DownloadManager.Items.Where(i => i.IsSelected).ToList())
+        {
+            DownloadManager.Cancel(item);
+        }
+        return this;
+    }
+
+    public AppScenarioPipeline BatchDelete()
+    {
+        foreach (var item in DownloadManager.Items.Where(i => i.IsSelected).ToList())
+        {
+            DownloadManager.Items.Remove(item);
+        }
+        return this;
+    }
+
+    public void AssertPlaylistCount(int count)
+    {
+        Xunit.Assert.Equal(count, Playlist.Tracks.Count);
+    }
+
+    public void AssertCurrentTrack(Func<MediaTrack?, bool> predicate)
+    {
+        Xunit.Assert.True(predicate(Playlist.Current), "현재 재생목록 트랙이 조건에 부합하지 않습니다.");
+    }
+
+    public void Dispose()
+    {
+        try
+        {
+            if (Directory.Exists(TempDir))
+                Directory.Delete(TempDir, recursive: true);
+        }
+        catch { }
+    }
+}