first commit

Interfaces/Services/IAdminClientDirectoryService.cs

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+using Fitness_core_BE.Models.IOs;
+using Microsoft.AspNetCore.Http;
+
+namespace Fitness_core_BE.Interfaces.Services
+{
+    public interface IAdminClientDirectoryService
+    {
+        Task<PagedResult<ClientSummary>> ListAsync(ClientDirectoryQuery query);
+        Task<object> GetByIdAsync(Guid id);
+        Task<PairingCodeResult> GeneratePairingCodeAsync(Guid clientId);
+        Task<AdminClientDevicesResult> GetDevicesAsync(Guid clientId);
+        // Re-sends the "set your password" welcome email (with a fresh temp password + link)
+        // for a client whose account has no usable password yet.
+        Task ResendWelcomeEmailAsync(Guid clientId, HttpContext httpContext);
+    }
+}