[Add] MasterData Services.

AMREZ.EOP.Application/UseCases/MasterData/Allergen/GetAllergenUseCase.cs

@@ -0,0 +1,17 @@
+using AMREZ.EOP.Abstractions.Applications.UseCases.MasterData.Allergen;
+using AMREZ.EOP.Abstractions.Infrastructures.Repositories;
+using AMREZ.EOP.Contracts.DTOs.MasterData.Allergen;
+
+namespace AMREZ.EOP.Application.UseCases.MasterData.Allergen;
+
+public class GetAllergenUseCase : IGetAllergenUseCase
+{
+    private readonly IAllergenRepository _repo;
+    public GetAllergenUseCase(IAllergenRepository repo) => _repo = repo;
+
+    public async Task<AllergenResponse?> ExecuteAsync(Guid id, CancellationToken ct = default)
+    {
+        var e = await _repo.GetAsync(id, ct);
+        return e is null ? null : new AllergenResponse(e.Id, e.Scope, e.Code, e.Name, e.NameI18n, e.OverridesGlobalId, e.IsActive, e.IsSystem, e.Meta);
+    }
+}