Replace selectable name sets with a country that owns names and climate presets.

Create picks a country; climate is rolled from the school seed and stored. Old Slavic saves lift as Russia.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/HSchool.AppHost.Tests/ExamplePackTests.cs

@@ -28,8 +28,8 @@ public class ExamplePackTests(AppHostFixture fixture)
         Assert.Equal("Кабинет директора", Assert.Single(ru.Rooms, room => room.DefName == "PrincipalsOffice").Label);
         Assert.Equal("Кладовая", Assert.Single(ru.Rooms, room => room.DefName == "ExampleStore").Label);
         Assert.Equal("Storeroom", Assert.Single(en.Rooms, room => room.DefName == "ExampleStore").Label);
-        Assert.Equal("Примерные имена", Assert.Single(ru.NameSets, set => set.DefName == "ExampleNames").Label);
-        Assert.Equal("Example names", Assert.Single(en.NameSets, set => set.DefName == "ExampleNames").Label);
+        Assert.Equal("Примерные имена", Assert.Single(ru.Countries, set => set.DefName == "ExampleNames").Label);
+        Assert.Equal("Example names", Assert.Single(en.Countries, set => set.DefName == "ExampleNames").Label);
         Assert.Equal("yard", ru.DefaultMap.Territory?.Id);
     }
 
@@ -139,14 +139,14 @@ public class ExamplePackTests(AppHostFixture fixture)
         IReadOnlyList<DefInfoResponse> Floors,
         IReadOnlyList<RoomInfoResponse> Rooms,
         IReadOnlyList<DefInfoResponse> Things,
-        IReadOnlyList<NameSetInfoResponse> NameSets,
+        IReadOnlyList<CountryInfoResponse> Countries,
         DayFrameResponse? DayFrame,
         IReadOnlyList<HolidayInfoResponse> Holidays,
         MapLayoutResponse DefaultMap);
 
     private sealed record DefInfoResponse(string DefName, string Label);
 
-    private sealed record NameSetInfoResponse(string DefName, string Label);
+    private sealed record CountryInfoResponse(string DefName, string Label);
 
     private sealed record RoomInfoResponse(
         string DefName,