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

tests/Paca.Tests/Core/MultiTrackMediaMuxerGateTests.cs

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+using System;
+using System.Collections.Generic;
+using Paca.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class MultiTrackMediaMuxerGateTests
+{
+    [Fact]
+    public void Gate377_MultiTrackMediaMuxer_MapsMultipleAudioTracks_Correctly()
+    {
+        var job = new MuxJobSpecification
+        {
+            VideoTrack = new TrackSpec("C:\\media\\video.mp4", "copy"),
+            AudioTracks = new List<TrackSpec>
+            {
+                new("C:\\media\\audio_kor.m4a", "copy", Language: "kor", Title: "한국어 더빙", IsDefault: true),
+                new("C:\\media\\audio_eng.m4a", "copy", Language: "eng", Title: "English Original", IsDefault: false)
+            },
+            OutputPath = "C:\\media\\output_multitrack.mkv"
+        };
+
+        var cmd = MultiTrackMediaMuxer.BuildMuxCommandLine(job);
+
+        Assert.Contains("-i \"C:\\media\\video.mp4\"", cmd);
+        Assert.Contains("-i \"C:\\media\\audio_kor.m4a\"", cmd);
+        Assert.Contains("-i \"C:\\media\\audio_eng.m4a\"", cmd);
+        Assert.Contains("-map 0:v:0", cmd);
+        Assert.Contains("-map 1:a:0", cmd);
+        Assert.Contains("-map 2:a:0", cmd);
+    }
+
+    [Fact]
+    public void Gate378_MultiTrackMediaMuxer_InjectsAudioMetadataTags()
+    {
+        var job = new MuxJobSpecification
+        {
+            VideoTrack = new TrackSpec("video.mp4", "copy"),
+            AudioTracks = new List<TrackSpec>
+            {
+                new("audio_kor.m4a", "copy", "kor", "한국어 더빙", true),
+                new("audio_eng.m4a", "copy", "eng", "English Original", false)
+            },
+            OutputPath = "output.mkv"
+        };
+
+        var cmd = MultiTrackMediaMuxer.BuildMuxCommandLine(job);
+
+        Assert.Contains("-metadata:s:a:0 language=kor", cmd);
+        Assert.Contains("-metadata:s:a:0 title=\"한국어 더빙\"", cmd);
+        Assert.Contains("-metadata:s:a:1 language=eng", cmd);
+        Assert.Contains("-metadata:s:a:1 title=\"English Original\"", cmd);
+    }
+
+    [Fact]
+    public void Gate379_MultiTrackMediaMuxer_SetsDefaultDisposition_ForPrimaryTrack()
+    {
+        var job = new MuxJobSpecification
+        {
+            VideoTrack = new TrackSpec("video.mp4", "copy"),
+            AudioTracks = new List<TrackSpec>
+            {
+                new("audio_kor.m4a", "copy", "kor", "한국어", true),
+                new("audio_eng.m4a", "copy", "eng", "English", false)
+            },
+            OutputPath = "output.mkv"
+        };
+
+        var cmd = MultiTrackMediaMuxer.BuildMuxCommandLine(job);
+
+        Assert.Contains("-disposition:a:0 default", cmd);
+    }
+
+    [Fact]
+    public void Gate380_MultiTrackMediaMuxer_IncludesSubtitlesAndBuildsFullCommand()
+    {
+        var job = new MuxJobSpecification
+        {
+            VideoTrack = new TrackSpec("C:\\in\\video.mp4", "copy"),
+            AudioTracks = new List<TrackSpec>
+            {
+                new("C:\\in\\audio.aac", "copy", "kor", "Main Audio", true)
+            },
+            SubtitleTracks = new List<TrackSpec>
+            {
+                new("C:\\in\\subs_kr.srt", "copy", "kor", "한국어 자막", true)
+            },
+            OutputPath = "C:\\out\\final.mkv"
+        };
+
+        var cmd = MultiTrackMediaMuxer.BuildMuxCommandLine(job);
+
+        Assert.Contains("-i \"C:\\in\\subs_kr.srt\"", cmd);
+        Assert.Contains("-map 2:s:0", cmd);
+        Assert.Contains("-metadata:s:s:0 language=kor", cmd);
+        Assert.Contains("-metadata:s:s:0 title=\"한국어 자막\"", cmd);
+        Assert.Contains("-c copy", cmd);
+        Assert.EndsWith("\"C:\\out\\final.mkv\" -y", cmd);
+    }
+}