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

tests/Paca.Tests/App/DesktopDeepLinkGateTests.cs

@@ -0,0 +1,42 @@
+using System;
+using System.IO;
+using Paca.App;
+using Paca.Mobile.Core;
+using Paca.Tests.Infrastructure;
+using Xunit;
+
+namespace Paca.Tests.App;
+
+public class DesktopDeepLinkGateTests
+{
+    [Fact]
+    public void Gate219_DesktopStartupModeParser_ExtractsDeepLinkArgument()
+    {
+        // Arrange
+        var args = new[] { "paca://download?url=https%3A%2F%2Fexample.com%2Fvideo%2F999&format=mp4" };
+
+        // Act
+        var success = DesktopStartupModeParser.TryExtractDeepLink(args, out var action);
+
+        // Assert
+        Assert.True(success);
+        Assert.NotNull(action);
+        var downloadAction = Assert.IsType<PacaDownloadDeepLinkAction>(action);
+        Assert.Equal("https://example.com/video/999", downloadAction.TargetUrl);
+        Assert.Equal("mp4", downloadAction.Format);
+    }
+
+    [Fact]
+    public void Gate220_InstallerScript_Includes_PacaCustomProtocolRegistry()
+    {
+        var installerPath = Path.Combine(SourceTree.Root, "build", "installer.iss");
+        Assert.True(File.Exists(installerPath), "installer.iss must exist");
+
+        var content = File.ReadAllText(installerPath);
+
+        // Protocol registration
+        Assert.Contains(@"Software\Classes\paca", content);
+        Assert.Contains(@"""URL Protocol""", content);
+        Assert.Contains(@"Software\Classes\paca\shell\open\command", content);
+    }
+}