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/DesktopTrayAndGatewayPushGateTests.cs

@@ -0,0 +1,61 @@
+using System;
+using System.IO;
+using System.Text.Json;
+using Paca.App;
+using Paca.Server.Gateway;
+using Paca.Tests.Infrastructure;
+using Xunit;
+
+namespace Paca.Tests.App;
+
+/// <summary>
+/// Gate 164 ~ 166: 데스크톱 트레이 알림 및 모바일 양방향 실시간 게이트웨이 푸시 스트림 기계적 검증
+/// </summary>
+public class DesktopTrayAndGatewayPushGateTests
+{
+    [Fact]
+    public void Gate164_DesktopTrayNotification_Event_Payload()
+    {
+        var payload = new DesktopTrayNotificationPayload(
+            Title: "모바일에서 다운로드 수신",
+            Message: "Galaxy S24에서 '4K 여행 브이로그' 다운로드를 전송했습니다.",
+            Type: TrayNotificationType.Info,
+            Timestamp: DateTimeOffset.UtcNow
+        );
+
+        Assert.Equal("모바일에서 다운로드 수신", payload.Title);
+        Assert.Equal(TrayNotificationType.Info, payload.Type);
+        Assert.False(string.IsNullOrWhiteSpace(payload.Message));
+    }
+
+    [Fact]
+    public void Gate165_GatewayPushEvent_Serialization_And_Types()
+    {
+        var pushEvent = new GatewayPushEvent(
+            EventId: "evt-901",
+            EventType: GatewayEventType.DownloadFinished,
+            Title: "다운로드 완료",
+            PayloadJson: "{\"id\":\"job-12\",\"fileName\":\"Nature_4K.mp4\"}",
+            OccurredAt: DateTimeOffset.UtcNow
+        );
+
+        var json = JsonSerializer.Serialize(pushEvent);
+        var deserialized = JsonSerializer.Deserialize<GatewayPushEvent>(json);
+
+        Assert.NotNull(deserialized);
+        Assert.Equal("evt-901", deserialized.EventId);
+        Assert.Equal(GatewayEventType.DownloadFinished, deserialized.EventType);
+        Assert.Contains("Nature_4K.mp4", deserialized.PayloadJson);
+    }
+
+    [Fact]
+    public void Gate166_ServerHost_GatewayEvents_Endpoint_Registered()
+    {
+        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);
+
+        Assert.Contains("/api/gateway/events", code);
+    }
+}