refactor: relocate options classes to dedicated Options folders

Move configuration options from Core/DataAccess/DataSync/ExcelIO to
dedicated Options folders within each project for better organization.
Update all references and tests accordingly.

NEW/src/JdeScoping.Api/DependencyInjection.cs

@@ -1,6 +1,6 @@
 using System.Text.Json.Serialization;
 using JdeScoping.Api.Hubs;
-using JdeScoping.Core.Options;
+using JdeScoping.Api.Options;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;

NEW/src/JdeScoping.Api/Options/AuthOptions.cs

@@ -0,0 +1,22 @@
+namespace JdeScoping.Api.Options;
+
+/// <summary>
+/// Authentication configuration options
+/// </summary>
+public class AuthOptions
+{
+    /// <summary>
+    /// Configuration section name
+    /// </summary>
+    public const string SectionName = "Auth";
+
+    /// <summary>
+    /// Name of the authentication cookie.
+    /// </summary>
+    public string CookieName { get; set; } = "ScopingTool.Auth";
+
+    /// <summary>
+    /// Cookie expiration in minutes (default: 8 hours).
+    /// </summary>
+    public int CookieExpirationMinutes { get; set; } = 480;
+}