Enhance school creation and staffing management with native language support

- Updated protocol documentation to include `nativeLanguages` in `nameSets` and added `nativeLanguage` to school creation options.
- Enhanced the UI for school creation to allow selection of native languages, improving user experience.
- Revised API interfaces to accommodate new native language features, ensuring proper data handling.
- Improved localization strings to support new native language functionalities in both English and Russian.
- Updated tests to validate the new native language features and ensure robust functionality in staffing scenarios.

src/HSchool.Server/Api/ModEndpoints.cs

@@ -86,7 +86,7 @@ internal sealed record CatalogResponse(
     IReadOnlyList<DefInfoResponse> Floors,
     IReadOnlyList<RoomInfoResponse> Rooms,
     IReadOnlyList<DefInfoResponse> Things,
-    IReadOnlyList<DefInfoResponse> NameSets,
+    IReadOnlyList<NameSetInfoResponse> NameSets,
     IReadOnlyList<SubjectInfoResponse> Subjects,
     DayFrameResponse? DayFrame,
     IReadOnlyList<HolidayInfoResponse> Holidays,
@@ -99,7 +99,7 @@ internal sealed record CatalogResponse(
             Placeable(catalog.Floors.Values, catalog, locale),
             PlaceableRooms(catalog, locale),
             PlaceableThings(catalog, locale),
-            Placeable(catalog.NameSets.Values, catalog, locale),
+            PlaceableNameSets(catalog, locale),
             PlaceableSubjects(catalog, locale),
             MapDayFrame(catalog, locale),
             PlaceableHolidays(catalog, locale),
@@ -113,6 +113,22 @@ internal sealed record CatalogResponse(
             .Select(def => new DefInfoResponse(def.DefName, catalog.Label(locale, def)))
             .ToArray();
 
+    private static IReadOnlyList<NameSetInfoResponse> PlaceableNameSets(DefCatalog catalog, string locale) =>
+        catalog.NameSets.Values
+            .Where(def => !def.Abstract)
+            .OrderBy(def => def.DefName, StringComparer.Ordinal)
+            .Select(def => new NameSetInfoResponse(
+                def.DefName,
+                catalog.Label(locale, def),
+                def.Spoken
+                    .Select(skill => new DefInfoResponse(
+                        skill,
+                        catalog.Skills.TryGetValue(skill, out var language)
+                            ? catalog.Label(locale, language)
+                            : skill))
+                    .ToArray()))
+            .ToArray();
+
     private static IReadOnlyList<DefInfoResponse> PlaceableThings(DefCatalog catalog, string locale) =>
         catalog.Things.Values
             .Where(def => !def.Abstract)
@@ -178,6 +194,11 @@ internal sealed record CatalogResponse(
 
 internal sealed record DefInfoResponse(string DefName, string Label, int PupilSlots = 0);
 
+internal sealed record NameSetInfoResponse(
+    string DefName,
+    string Label,
+    IReadOnlyList<DefInfoResponse> NativeLanguages);
+
 internal sealed record RoomInfoResponse(
     string DefName,
     string Label,