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/page-fetcher-api-models/Settings/PageFetcherSettings.cs

@@ -0,0 +1,17 @@
+namespace PageFetcher.Models.Settings;
+
+/// <summary>
+/// Runtime settings for the page-fetcher service.
+/// Bound from the <c>PageFetcher</c> configuration section.
+/// </summary>
+public sealed class PageFetcherSettings
+{
+    /// <summary>Default Playwright wait condition (<c>networkidle</c>, <c>load</c>, <c>domcontentloaded</c>).</summary>
+    public string DefaultWaitFor { get; set; } = "networkidle";
+
+    /// <summary>Page navigation timeout in seconds.</summary>
+    public int TimeoutSeconds { get; set; } = 30;
+
+    /// <summary>Maximum characters stored/returned in the extracted text field.</summary>
+    public int MaxTextChars { get; set; } = 60_000;
+}