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

tests/Paca.Tests/Platform/AvaloniaAndMobileDiscoveryGateTests.cs

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+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Paca.Avalonia;
+using Paca.Mobile.Core;
+using Xunit;
+
+namespace Paca.Tests.Platform;
+
+public class AvaloniaAndMobileDiscoveryGateTests
+{
+    private static string SolutionRoot
+    {
+        get
+        {
+            var dir = AppContext.BaseDirectory;
+            while (!string.IsNullOrEmpty(dir) && !File.Exists(Path.Combine(dir, "Paca.slnx")) && !File.Exists(Path.Combine(dir, "Paca.sln")))
+            {
+                var parent = Directory.GetParent(dir);
+                if (parent == null) break;
+                dir = parent.FullName;
+            }
+            return dir ?? AppContext.BaseDirectory;
+        }
+    }
+
+    // =========================================================================
+    // Gate 1: Avalonia MainViewModel CTS 리소스 누수 방지 검증
+    // =========================================================================
+    [Fact]
+    public async Task Gate_Avalonia_MainViewModel_Cts_Is_Disposed_And_Nulled_After_Execution()
+    {
+        var vm = new MainViewModel();
+        vm.Url = "https://example.com/not-supported"; // 즉시 실패/완료 유도
+        await vm.RunDownloadAsync();
+
+        Assert.False(vm.IsBusy);
+        Assert.False(vm.HasActiveCts, "다운로드 완료 또는 실패 후 CTS는 Dispose되고 null 처리되어야 합니다.");
+    }
+
+    // =========================================================================
+    // Gate 2: Avalonia MainViewModel Log 컬렉션 슬라이딩 윈도우 상한(200개) 검증
+    // =========================================================================
+    [Fact]
+    public void Gate_Avalonia_MainViewModel_Log_Sliding_Window_Limit()
+    {
+        var vm = new MainViewModel();
+        for (int i = 0; i < 300; i++)
+        {
+            vm.AddLogEntry($"Log item {i}");
+        }
+
+        Assert.True(vm.Log.Count <= 200, $"Log 항목 수는 최대 200개 이하로 캡핑되어야 합니다. 현재: {vm.Log.Count}");
+    }
+
+    // =========================================================================
+    // Gate 3: Avalonia MainWindow.axaml 바인딩 무결성 (CompileBindings 및 WPF 잔재 제거)
+    // =========================================================================
+    [Fact]
+    public void Gate_Avalonia_MainWindow_Axaml_Clean_Bindings()
+    {
+        var axamlPath = Path.Combine(SolutionRoot, "src", "Paca.Avalonia", "MainWindow.axaml");
+        Assert.True(File.Exists(axamlPath), $"MainWindow.axaml must exist at {axamlPath}");
+
+        var content = File.ReadAllText(axamlPath);
+        Assert.DoesNotContain("x:CompileBindings=\"False\"", content);
+        Assert.DoesNotContain("UpdateSourceTrigger=PropertyChanged", content);
+    }
+
+    // =========================================================================
+    // Gate 4: LanDiscoveryMessage 디바이스명에 파이프(|) 포함 시 파싱 무결성 검증
+    // =========================================================================
+    [Fact]
+    public void Gate_LanDiscoveryMessage_Parses_DeviceName_With_Pipes()
+    {
+        var devNameWithPipes = "My|Studio|PC";
+        var endpoint = "192.168.1.100:5000";
+        var rawPayload = $"PACA_DISCOVERY|PONG|{devNameWithPipes}|{endpoint}|1|abc123fingerprint";
+
+        var parsed = LanDiscoveryMessage.Parse(rawPayload);
+        Assert.NotNull(parsed);
+        Assert.Equal(LanDiscoveryMessageType.Pong, parsed.Type);
+        Assert.Equal(devNameWithPipes, parsed.DeviceName);
+        Assert.Equal(endpoint, parsed.Endpoint);
+        Assert.True(parsed.IsPairingAllowed);
+        Assert.Equal("abc123fingerprint", parsed.Fingerprint);
+    }
+
+    // =========================================================================
+    // Gate 5: LanDiscoveryProber IPv6 엔드포인트 브래킷 포맷팅 검증
+    // =========================================================================
+    [Fact]
+    public void Gate_LanDiscoveryProber_Formats_IPv6_Endpoint_With_Brackets()
+    {
+        using var prober = new LanDiscoveryProber();
+        DiscoveredLanDevice? foundDevice = null;
+        prober.OnDeviceFound += d => foundDevice = d;
+
+        // 원격 송신자가 0.0.0.0:5000을 보냈고, 송신자 IP가 IPv6인 경우
+        var ipv6Sender = "fe80::1";
+        prober.HandleReceivedPayload("PACA_DISCOVERY|PONG|TestNode|0.0.0.0:5000|1|fp", ipv6Sender);
+
+        Assert.NotNull(foundDevice);
+        Assert.Contains("[fe80::1]:5000", foundDevice.Endpoint);
+        Assert.Equal("http://[fe80::1]:5000", foundDevice.HttpBaseUrl);
+    }
+}