Restructure project

Service/Service.Core/Service.Core.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <RootNamespace>BusinessLayer</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Repository\Repository.Core\Repository.Core.csproj" />
+  </ItemGroup>
+</Project>

Service/Service.Core/Services/IUserService.cs

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+using DataAccessLayer.Entities;
+
+namespace BusinessLayer.Services
+{
+    public interface IUserService
+    {
+        Task<IEnumerable<UserAccount>> GetAllAsync(int? limit = null, int? offset = null);
+        Task<UserAccount?> GetByIdAsync(Guid id);
+    }
+}

Service/Service.Core/Services/UserService.cs

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+using DataAccessLayer.Entities;
+using DataAccessLayer.Repositories;
+
+namespace BusinessLayer.Services
+{
+    public class UserService(IUserAccountRepository repository) : IUserService
+    {
+        public async Task<IEnumerable<UserAccount>> GetAllAsync(int? limit = null, int? offset = null)
+        {
+            return await repository.GetAll(limit, offset);
+        }
+
+        public async Task<UserAccount?> GetByIdAsync(Guid id)
+        {
+            return await repository.GetById(id);
+        }
+    }
+}