Refactor code structure and optimize performance across multiple modules

src/Concelier/__Tests/StellaOps.Concelier.Connector.Ru.Nkcki.Tests/RuNkckiJsonParserTests.cs

@@ -6,7 +6,8 @@ namespace StellaOps.Concelier.Connector.Ru.Nkcki.Tests;
 
 public sealed class RuNkckiJsonParserTests
 {
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Parse_WellFormedEntry_ReturnsDto()
     {
         const string json = """
@@ -40,6 +41,7 @@ public sealed class RuNkckiJsonParserTests
 """;
 
         using var document = JsonDocument.Parse(json);
+using StellaOps.TestKit;
         var dto = RuNkckiJsonParser.Parse(document.RootElement);
 
         Assert.Equal("BDU:2025-00001", dto.FstecId);