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/MobilePacaDropBatchBundleGateTests.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+using Paca.Mobile.Core;
+using Xunit;
+
+namespace Paca.Tests.Mobile;
+
+/// <summary>
+/// Gate 167 ~ 170: PacaDrop 다중 미디어 배치 번들링 & 자동 스트리밍 언패커 기계적 검증
+/// </summary>
+public class MobilePacaDropBatchBundleGateTests
+{
+    [Fact]
+    public void Gate167_BatchBundleManifest_Integrity()
+    {
+        var file1Data = Encoding.UTF8.GetBytes("Media Content 1 - 4K Video Stream");
+        var file2Data = Encoding.UTF8.GetBytes("Media Content 2 - 128k Audio Track");
+
+        var entries = new List<BundleEntryMetadata>
+        {
+            new("video1.mp4", file1Data.Length, Convert.ToHexString(SHA256.HashData(file1Data))),
+            new("audio1.mp3", file2Data.Length, Convert.ToHexString(SHA256.HashData(file2Data)))
+        };
+
+        var manifest = new BatchBundleManifest("bundle-001", entries, DateTimeOffset.UtcNow);
+
+        Assert.Equal("bundle-001", manifest.BundleId);
+        Assert.Equal(2, manifest.Entries.Count);
+        Assert.Equal(file1Data.Length + file2Data.Length, manifest.TotalBytes);
+        Assert.True(manifest.VerifyEntry("video1.mp4", file1Data));
+        Assert.False(manifest.VerifyEntry("video1.mp4", Encoding.UTF8.GetBytes("Corrupted")));
+    }
+
+    [Fact]
+    public async Task Gate168_BatchBundle_Pack_And_Unpack_Streaming()
+    {
+        var file1Data = Encoding.UTF8.GetBytes("Payload for Track 1");
+        var file2Data = Encoding.UTF8.GetBytes("Payload for Track 2");
+
+        using var bundleStream = new MemoryStream();
+
+        // 1. 번들 생성 (PC 측 동작 시뮬레이션)
+        await PacaBatchBundlePacker.PackAsync(bundleStream, new Dictionary<string, byte[]>
+        {
+            ["intro.mp4"] = file1Data,
+            ["outro.mp3"] = file2Data
+        });
+
+        bundleStream.Position = 0;
+
+        // 2. 모바일 언패커로 추출 (모바일 수신 시뮬레이션)
+        var tempExtractDir = Path.Combine(Path.GetTempPath(), "Paca_Test_Bundle_" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(tempExtractDir);
+
+        try
+        {
+            var extractedFiles = await PacaBatchBundleExtractor.ExtractAsync(bundleStream, tempExtractDir);
+
+            Assert.Equal(2, extractedFiles.Count);
+            Assert.True(File.Exists(Path.Combine(tempExtractDir, "intro.mp4")));
+            Assert.True(File.Exists(Path.Combine(tempExtractDir, "outro.mp3")));
+
+            var read1 = await File.ReadAllBytesAsync(Path.Combine(tempExtractDir, "intro.mp4"));
+            var read2 = await File.ReadAllBytesAsync(Path.Combine(tempExtractDir, "outro.mp3"));
+
+            Assert.Equal(file1Data, read1);
+            Assert.Equal(file2Data, read2);
+        }
+        finally
+        {
+            if (Directory.Exists(tempExtractDir))
+            {
+                Directory.Delete(tempExtractDir, recursive: true);
+            }
+        }
+    }
+
+    [Fact]
+    public async Task Gate169_BatchBundle_CorruptedEntry_FailsSafely()
+    {
+        using var garbageStream = new MemoryStream(Encoding.UTF8.GetBytes("Not A Valid Paca Bundle Data"));
+        var tempExtractDir = Path.Combine(Path.GetTempPath(), "Paca_Corrupt_" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(tempExtractDir);
+
+        try
+        {
+            await Assert.ThrowsAnyAsync<Exception>(async () =>
+            {
+                await PacaBatchBundleExtractor.ExtractAsync(garbageStream, tempExtractDir);
+            });
+        }
+        finally
+        {
+            if (Directory.Exists(tempExtractDir)) Directory.Delete(tempExtractDir, recursive: true);
+        }
+    }
+
+    [Fact]
+    public void Gate170_AutoIngestToLibraryManager()
+    {
+        var manager = new OfflineLibraryManager();
+        var extractedEntries = new List<BundleExtractedFile>
+        {
+            new("item-1", "video.mp4", 50_000_000, "/temp/video.mp4", true),
+            new("item-2", "song.mp3", 5_000_000, "/temp/song.mp3", true)
+        };
+
+        foreach (var entry in extractedEntries)
+        {
+            manager.RegisterMedia(new OfflineMediaItem(
+                entry.Id,
+                entry.FileName,
+                entry.SizeBytes,
+                entry.FilePath,
+                DateTimeOffset.UtcNow,
+                entry.IsChecksumVerified
+            ));
+        }
+
+        Assert.Equal(55_000_000L, manager.TotalPacaBytes);
+        Assert.Equal(2, manager.GetItems(MediaFilter.All, MediaSortOrder.NewestFirst).Count);
+    }
+}