first commit

Interfaces/IAdminClientDirectoryRepository.cs

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+using Fitness_core_BE.Models;
+
+namespace Fitness_core_BE.Interfaces
+{
+    public interface IAdminClientDirectoryRepository
+    {
+        Task<(List<Client> Items, int Total)> ListAsync(string? search, int page, int pageSize, CancellationToken ct = default);
+        Task<Client?> GetByIdAsync(Guid clientId, CancellationToken ct = default);
+        Task<bool> ClientExistsAsync(Guid clientId, CancellationToken ct = default);
+    }
+}