feat: add local authentication

Tiku.Application/Auth/ISessionService.cs

@@ -0,0 +1,19 @@
+using Tiku.Domain.Tenancy;
+
+namespace Tiku.Application.Auth;
+
+public interface ISessionService
+{
+    string GenerateRefreshToken();
+    string HashRefreshToken(string refreshToken);
+
+    Task<AuthTokenPair> IssueAsync(
+        Guid userId,
+        string? phone,
+        string? email,
+        TenantMembership membership,
+        string provider,
+        string? ipAddress,
+        string? userAgent,
+        CancellationToken cancellationToken = default);
+}