Move SmtpSettings and PageFetcherSettings into their respective models projects

Settings classes now live in the -models project alongside DTOs and client
interfaces, eliminating the Settings/ folder from both API projects.

- SmtpSettings: email-api/Settings/ → email-api-models/Settings/ (namespace EmailApi.Models.Settings)
- PageFetcherSettings: page-fetcher-api/Settings/ → page-fetcher-api-models/Settings/ (namespace PageFetcher.Models.Settings)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Apis/email-api/Program.cs

@@ -5,6 +5,7 @@ using Email.Data.Repositories.Contracts;
 using Email.Data.Services;
 using EmailApi.Services;
 using Microsoft.EntityFrameworkCore;
+using EmailApi.Models.Settings;
 using Models.Settings;
 using Serilog;
 using StartupHelpers;

Apis/email-api/Services/SmtpEmailDispatcher.cs

@@ -4,6 +4,7 @@ using MailKit.Net.Smtp;
 using MailKit.Security;
 using Microsoft.Extensions.Options;
 using MimeKit;
+using EmailApi.Models.Settings;
 using Models.Settings;
 
 namespace EmailApi.Services;

Apis/email-api/Settings/SmtpSettings.cs

@@ -1,10 +0,0 @@
-namespace Models.Settings;
-
-public sealed class SmtpSettings
-{
-    public string Host { get; set; } = "";
-    public int Port { get; set; } = 587;
-    public string Username { get; set; } = "";
-    public string Password { get; set; } = "";
-    public bool UseStartTls { get; set; } = true;
-}