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

tests/Paca.Tests/Core/VideoPosterExtractorGateTests.cs

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+using System;
+using Paca.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class VideoPosterExtractorGateTests
+{
+    [Fact]
+    public void Gate381_VideoPosterExtractor_CalculatesOptimalSeekTime()
+    {
+        // For short 5s clip -> 1.0s
+        var shortClip = VideoPosterExtractor.CalculateOptimalSeekTime(5.0);
+        Assert.Equal(1.0, shortClip);
+
+        // For 60s video -> 10% is 6.0s
+        var midVideo = VideoPosterExtractor.CalculateOptimalSeekTime(60.0);
+        Assert.Equal(6.0, midVideo);
+
+        // For 2-hour movie (7200s) -> Capped at 10.0s (to avoid spoilers while skipping black intro)
+        var movie = VideoPosterExtractor.CalculateOptimalSeekTime(7200.0);
+        Assert.Equal(10.0, movie);
+    }
+
+    [Fact]
+    public void Gate382_VideoPosterExtractor_BuildsScalingFilter_PreservingAspect()
+    {
+        var spec = new PosterExtractionSpec(
+            SeekTimeSec: 4.5,
+            Width: 640,
+            Height: 360,
+            Format: PosterFormat.Jpeg,
+            Quality: 85
+        );
+
+        var filter = VideoPosterExtractor.BuildScalingFilter(spec);
+        Assert.Equal("scale=640:360:force_original_aspect_ratio=decrease", filter);
+    }
+
+    [Fact]
+    public void Gate383_VideoPosterExtractor_BuildsWebpAndJpegQualityFlags()
+    {
+        var webpSpec = new PosterExtractionSpec(3.0, 400, 400, PosterFormat.WebP, Quality: 80);
+        var webpCmd = VideoPosterExtractor.BuildPosterCommandLine("in.mp4", "out.webp", webpSpec);
+        Assert.Contains("-c:v libwebp -quality 80", webpCmd);
+
+        var jpegSpec = new PosterExtractionSpec(3.0, 400, 400, PosterFormat.Jpeg, Quality: 90);
+        var jpegCmd = VideoPosterExtractor.BuildPosterCommandLine("in.mp4", "out.jpg", jpegSpec);
+        Assert.Contains("-q:v 2", jpegCmd); // High quality jpeg
+    }
+
+    [Fact]
+    public void Gate384_VideoPosterExtractor_BuildsFullSingleFrameCommandLine()
+    {
+        var spec = new PosterExtractionSpec(5.0, 1280, 720, PosterFormat.Jpeg, 85);
+        var cmd = VideoPosterExtractor.BuildPosterCommandLine("C:\\vid.mp4", "C:\\thumb.jpg", spec);
+
+        Assert.Contains("-ss 5.00 -i \"C:\\vid.mp4\"", cmd);
+        Assert.Contains("-vframes 1", cmd);
+        Assert.EndsWith("\"C:\\thumb.jpg\" -y", cmd);
+    }
+}