Initial commit

Services/Auth/IAppRegistrationService.cs

@@ -0,0 +1,16 @@
+namespace SharepointToolbox.Web.Services.Auth;
+
+public interface IAppRegistrationService
+{
+    /// <summary>
+    /// Creates an Entra ID app registration in the target tenant using a delegated admin token
+    /// (requires Application.ReadWrite.All + DelegatedPermissionGrant.ReadWrite.All scope).
+    /// Grants org-wide admin consent for SharePoint + Graph delegated permissions.
+    /// Returns the new app's client ID (appId).
+    /// </summary>
+    Task<string> CreateAsync(
+        string adminAccessToken,
+        string tenantName,
+        string redirectUri,
+        CancellationToken ct = default);
+}