SEO landing pages: dynamic role+city titles, pretty URLs, sitemap combos

Google Search Console shows all top queries are «استخدام [نقش] [شهر]», but the
filtered index pages all shared the generic title «موقعیت‌های استخدامی» and
weren't in the sitemap, so nothing ranked for those exact searches.

- Jobs/Shifts/Talent index pages now set a dynamic <title>/<h1>/meta from the
  active role+city (e.g. «استخدام پزشک عمومی در تهران»).
- Pretty SEO routes /استخدام/{role}/{city?} and /شیفت/{role}/{city?} (via
  AddPageRoute) resolve slugs → filters; unknown slug → 404. The layout already
  derives the canonical from the path, so each pretty URL is its own canonical
  and the query-string forms canonicalize to /Jobs (no duplicate content).
- sitemap.xml now lists role-only and role×city landing URLs for every combo
  with live listings (URL-encoded), so Google discovers them.
- New SeoSlug helper (Persian-tolerant: ي/ك, ZWNJ, hyphen/space).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/JobsMedical.Web/Services/SeoSlug.cs

@@ -0,0 +1,22 @@
+using System.Text.RegularExpressions;
+
+namespace JobsMedical.Web.Services;
+
+/// <summary>
+/// Pretty-URL slugs for SEO landing pages (e.g. /استخدام/پزشک-عمومی/تهران). We keep Persian
+/// characters — Google indexes UTF-8 URLs fine and they read naturally — and just turn spaces into
+/// hyphens. Matching is tolerant of ي/ك, ZWNJ and hyphen/space variants so a hand-typed or
+/// search-engine-rewritten slug still resolves.
+/// </summary>
+public static class SeoSlug
+{
+    /// <summary>The canonical slug for a role/city name («پزشک عمومی» → «پزشک-عمومی»).</summary>
+    public static string Of(string? name) => Key(name);
+
+    /// <summary>True when <paramref name="slug"/> (from the URL) refers to <paramref name="name"/>.</summary>
+    public static bool Matches(string? name, string? slug) => Key(name) == Key(slug);
+
+    private static string Key(string? s) => Regex.Replace(
+        (s ?? "").Trim().Replace('ي', 'ی').Replace('ك', 'ک').Replace('‌', ' ').Replace('-', ' '),
+        @"\s+", "-").ToLowerInvariant();
+}