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

tests/Paca.Tests/Browser/SearchEngineResolverTests.cs

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+using Paca.Browser;
+
+namespace Paca.Tests.Browser;
+
+// T1-4 검색엔진: 주소창 입력이 URL인지 검색어인지 판별하고, 키워드(g, yt, ...)로 엔진을 전환한다.
+public class SearchEngineResolverTests
+{
+    private readonly SearchEngineResolver _resolver = new("Google");
+
+    [Theory]
+    [InlineData("https://example.com", "https://example.com")]           // 스킴 있음 → 그대로
+    [InlineData("http://example.com/path?q=1", "http://example.com/path?q=1")]
+    [InlineData("example.com", "https://example.com")]                   // 도메인 → https 보정
+    [InlineData("www.example.co.kr/a/b", "https://www.example.co.kr/a/b")]
+    [InlineData("sub.domain.org", "https://sub.domain.org")]
+    [InlineData("localhost", "https://localhost")]                       // localhost → URL
+    [InlineData("localhost:8080/x", "https://localhost:8080/x")]
+    [InlineData("192.168.1.10", "https://192.168.1.10")]                 // IPv4 → URL
+    [InlineData("192.168.1.10:9000/v.html", "https://192.168.1.10:9000/v.html")]
+    [InlineData("file:///C:/tmp/a.html", "file:///C:/tmp/a.html")]
+    public void Url_입력은_URL_의도로_판별한다(string input, string expected)
+    {
+        var intent = _resolver.Resolve(input);
+        Assert.NotNull(intent);
+        Assert.True(intent.IsUrl);
+        Assert.Equal(expected, intent.Target);
+    }
+
+    [Theory]
+    [InlineData("hello world")]        // 공백 포함 일반어 → 검색
+    [InlineData("cats")]               // 점 없는 단일 단어 → 검색
+    [InlineData("how to download mp4")]
+    [InlineData("나는 한국어 검색어")]
+    public void 검색어_입력은_기본_엔진으로_검색한다(string input)
+    {
+        var intent = _resolver.Resolve(input);
+        Assert.NotNull(intent);
+        Assert.False(intent.IsUrl);
+        Assert.Equal("https://www.google.com/search?q=" + Uri.EscapeDataString(input).Replace("%20", "+"), intent.Target);
+        Assert.Equal("Google", intent.EngineName);
+    }
+
+    [Fact]
+    public void 키워드_g는_Google로_라우팅한다()
+    {
+        var intent = _resolver.Resolve("g cute cats");
+        Assert.NotNull(intent);
+        Assert.False(intent.IsUrl);
+        Assert.Contains("google.com/search", intent.Target);
+        Assert.Contains("cute+cats", intent.Target);
+    }
+
+    [Fact]
+    public void 키워드_yt는_YouTube_검색으로_라우팅한다()
+    {
+        var intent = _resolver.Resolve("yt lofi beats");
+        Assert.NotNull(intent);
+        Assert.False(intent.IsUrl);
+        Assert.Contains("youtube.com/results", intent.Target);
+        Assert.Equal("YouTube", intent.EngineName);
+    }
+
+    [Fact]
+    public void 기본_엔진을_Bing으로_바꾸면_일반_검색어가_Bing으로_간다()
+    {
+        var r = new SearchEngineResolver("Bing");
+        var intent = r.Resolve("weather today");
+        Assert.NotNull(intent);
+        Assert.False(intent.IsUrl);
+        Assert.Contains("bing.com/search", intent.Target);
+    }
+
+    [Fact]
+    public void 알_수_없는_키워드는_검색어의_일부로_취급한다()
+    {
+        // "zzz query" — zzz 는 등록된 키워드가 아님 → 전체가 기본 엔진 검색어
+        var intent = _resolver.Resolve("zzz query");
+        Assert.NotNull(intent);
+        Assert.False(intent.IsUrl);
+        Assert.Contains("zzz+query", intent.Target);
+    }
+
+    [Fact]
+    public void 키워드_단독_입력은_검색어로_취급한다()
+    {
+        var intent = _resolver.Resolve("g");
+        Assert.NotNull(intent);
+        Assert.False(intent.IsUrl);
+        Assert.EndsWith("q=g", intent.Target); // "g" 자체를 기본 엔진으로 검색
+    }
+
+    [Fact]
+    public void 커스텀_엔진_키워드를_등록하면_사용_가능하다()
+    {
+        var r = new SearchEngineResolver("Google", customEngines:
+            new[] { new SearchEngine("Wikipedia", "w", "https://en.wikipedia.org/wiki/Special:Search?search={0}") });
+        var intent = r.Resolve("w mars rover");
+        Assert.NotNull(intent);
+        Assert.False(intent.IsUrl);
+        Assert.Contains("wikipedia.org", intent.Target);
+        Assert.Equal("Wikipedia", intent.EngineName);
+    }
+
+    [Fact]
+    public void 빈_입력은_Null을_반환한다()
+    {
+        Assert.Null(_resolver.Resolve(""));
+        Assert.Null(_resolver.Resolve("   "));
+    }
+
+    [Fact]
+    public void 프리셋에는_주요_엔진이_포함된다()
+    {
+        var names = SearchEngines.Presets.Select(e => e.Name).ToList();
+        Assert.Contains("Google", names);
+        Assert.Contains("Bing", names);
+        Assert.Contains("DuckDuckGo", names);
+        Assert.Contains("Naver", names);   // 한국 사용자
+        Assert.Contains("YouTube", names);
+    }
+}