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

tests/Paca.Tests/Browser/AppScenarioPipelineTests.cs

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+using Paca.App.ViewModels;
+using Paca.Core.Detection;
+using Paca.Tests.Infrastructure;
+using Xunit;
+
+namespace Paca.Tests.Browser;
+
+/// <summary>
+/// 19차 4대 핵심 비즈니스 시나리오 파이프라인 검증 테스트.
+/// </summary>
+public class AppScenarioPipelineTests
+{
+    [Fact]
+    public void 시나리오1_미디어감지_이벤트발화_및_중복필터링_파이프라인()
+    {
+        using var pipeline = AppScenarioPipeline.Create();
+
+        // 1. HLS 미디어 감지
+        pipeline.SimulateMediaDetection("https://example.com/live/playlist.m3u8", MediaKind.Hls);
+        pipeline.AssertQueueCount(1);
+        pipeline.AssertDetectedCount(1);
+
+        // 2. DASH 미디어 감지
+        pipeline.SimulateMediaDetection("https://example.com/video/manifest.mpd", MediaKind.Dash);
+        pipeline.AssertQueueCount(2);
+        pipeline.AssertDetectedCount(2);
+
+        // 3. 동일 HLS 미디어 중복 감지 시도 -> 큐 및 감지 이벤트가 중복되지 않아야 함
+        pipeline.SimulateMediaDetection("https://example.com/live/playlist.m3u8", MediaKind.Hls);
+        pipeline.AssertQueueCount(2);
+        pipeline.AssertDetectedCount(2);
+    }
+
+    [Fact]
+    public void 시나리오2_재생목록_생명주기_및_순환루프_파이프라인()
+    {
+        using var pipeline = AppScenarioPipeline.Create();
+
+        // 1. 트랙 3개 추가
+        pipeline.AddPlaylistTrack("https://test.local/t1.mp4", "Track 1", "Direct")
+                .AddPlaylistTrack("https://test.local/t2.mp4", "Track 2", "Direct")
+                .AddPlaylistTrack("https://test.local/t3.mp4", "Track 3", "Direct");
+
+        pipeline.AssertPlaylistCount(3);
+        pipeline.AssertCurrentTrack(t => t != null && t.Title == "Track 1");
+
+        // 2. 첫 번째 트랙 재생 완료 마킹 후 다음 트랙 이동
+        var t1 = pipeline.Playlist.Current!;
+        pipeline.SimulateTrackPlayed(t1);
+        Assert.True(pipeline.Playlist.Tracks[0].Played);
+
+        pipeline.SimulateNextTrack();
+        pipeline.AssertCurrentTrack(t => t != null && t.Title == "Track 2");
+
+        // 3. 마지막 트랙까지 이동 후 순환 루프(all 모드) 검증
+        pipeline.SimulateNextTrack();
+        pipeline.AssertCurrentTrack(t => t != null && t.Title == "Track 3");
+
+        pipeline.SimulateNextTrack();
+        pipeline.AssertCurrentTrack(t => t != null && t.Title == "Track 1");
+    }
+
+    [Fact]
+    public void 시나리오3_탭_세션_직렬화_및_콜드_복원_파이프라인()
+    {
+        using var pipeline = AppScenarioPipeline.Create();
+
+        // 1. 탭 3개 오픈
+        pipeline.OpenTab("https://site1.com")
+                .OpenTab("https://site2.com")
+                .OpenTab("https://site3.com");
+
+        Assert.Equal(3, pipeline.TabManager.Tabs.Count);
+
+        // 2. 세션 스냅샷 저장
+        var snapshot = pipeline.SaveSession();
+        Assert.NotNull(snapshot);
+        Assert.Equal(3, snapshot.Urls.Count);
+
+        // 3. 새로운 세션에 복원
+        using var restorePipeline = AppScenarioPipeline.Create();
+        restorePipeline.RestoreSession(snapshot);
+
+        Assert.Equal(3, restorePipeline.TabManager.Tabs.Count);
+        Assert.Equal("https://site1.com", restorePipeline.TabManager.Tabs[0].Url);
+        Assert.Equal("https://site2.com", restorePipeline.TabManager.Tabs[1].Url);
+        Assert.Equal("https://site3.com", restorePipeline.TabManager.Tabs[2].Url);
+    }
+
+    [Fact]
+    public void 시나리오4_다운로드_오류_발생_및_재시도_상태복구_파이프라인()
+    {
+        using var pipeline = AppScenarioPipeline.Create();
+
+        var item = new DownloadItemViewModel("Fail-Retry Test")
+        {
+            MediaUrl = new Uri("https://example.com/video.mp4"),
+            Kind = MediaKind.Direct,
+            Status = "실패",
+            Error = "Network connection timeout"
+        };
+        pipeline.DownloadManager.Items.Add(item);
+
+        Assert.Equal("실패", item.Status);
+        Assert.False(string.IsNullOrEmpty(item.Error));
+
+        // 재시도 요청
+        _ = pipeline.DownloadManager.RetryDownload(item);
+
+        // 에러가 초기화되고 재시도 카운트가 올라가야 함
+        Assert.Null(item.Error);
+        Assert.Equal(1, item.RetryCount);
+    }
+}