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

tests/Paca.Tests/Mobile/MobileAdaptiveTranscodingGateTests.cs

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+using System;
+using System.IO;
+using Paca.Mobile.Core;
+using Paca.Tests.Infrastructure;
+using Xunit;
+
+namespace Paca.Tests.Mobile;
+
+/// <summary>
+/// Gate 157 ~ 159: 모바일 적응형 스트리밍 트랜스코딩 & 데이터 세이버 오디오 추출 기계적 검증
+/// </summary>
+public class MobileAdaptiveTranscodingGateTests
+{
+    [Fact]
+    public void Gate157_AdaptiveStreamingProfile_Bandwidth_Estimation()
+    {
+        // 1시간 4K 영상 (약 15GB, ~33.3 Mbps)
+        long originalBytes = 15L * 1024 * 1024 * 1024;
+        var duration = TimeSpan.FromHours(1);
+
+        var originalProfile = AdaptiveStreamingProfile.OriginalDirect;
+        var cellularProfile = AdaptiveStreamingProfile.CellularDataSaver_720p;
+        var audioProfile = AdaptiveStreamingProfile.AudioPodcast_128k;
+
+        // 원본: 절감률 0%
+        Assert.Equal(0.0, originalProfile.CalculateDataSavingsPercent(originalBytes, duration));
+
+        // 720p 셀룰러: 약 675MB 소모 (1.5Mbps * 3600s / 8) -> 95%+ 절감
+        var cellularSavings = cellularProfile.CalculateDataSavingsPercent(originalBytes, duration);
+        Assert.InRange(cellularSavings, 90.0, 98.0);
+
+        // 오디오 전용: 약 57MB 소모 (128kbps * 3600s / 8) -> 99%+ 절감
+        var audioSavings = audioProfile.CalculateDataSavingsPercent(originalBytes, duration);
+        Assert.InRange(audioSavings, 98.0, 99.9);
+    }
+
+    [Fact]
+    public void Gate158_StreamingQualityManager_AutoSelection()
+    {
+        var manager = new StreamingQualityManager();
+
+        // 1. Wi-Fi 무제한 환경 -> 원본 직접 스트리밍
+        var wifiProfile = manager.SelectOptimalProfile(NetworkProfileType.WiFi, isDataSaverActive: false);
+        Assert.Equal(AdaptiveStreamingProfile.OriginalDirect, wifiProfile);
+
+        // 2. 3G/4G/5G 셀룰러 환경 -> 720p 데이터 세이버 자동 전환
+        var cellularProfile = manager.SelectOptimalProfile(NetworkProfileType.Cellular5G, isDataSaverActive: false);
+        Assert.Equal(AdaptiveStreamingProfile.CellularDataSaver_720p, cellularProfile);
+
+        // 3. 사용자 데이터 절약 모드 켬 -> 오디오 전용 모드 자동 추천
+        var saverProfile = manager.SelectOptimalProfile(NetworkProfileType.CellularLTE, isDataSaverActive: true);
+        Assert.Equal(AdaptiveStreamingProfile.AudioPodcast_128k, saverProfile);
+    }
+
+    [Fact]
+    public void Gate159_WebCompanion_AudioExtraction_Endpoint_Header_Audit()
+    {
+        var serverHostPath = Path.Combine(SourceTree.Root, "src", "Paca.Server", "ServerHost.cs");
+        Assert.True(File.Exists(serverHostPath), "ServerHost.cs must exist");
+
+        var code = File.ReadAllText(serverHostPath);
+
+        // 오디오 전용 스트리밍 엔드포인트 /api/audio/ 검증
+        Assert.Contains("/api/audio/{id}", code);
+        Assert.Contains("audio/mp4", code);
+    }
+}