Add «آماده به کار» (talent) listing type — workers offering themselves

Adds a third listing kind alongside Shift/Job for healthcare staff who
advertise their own availability (very common in Iranian medical
channels, e.g. "دندانپزشک آماده همکاری… ۵۰٪ تسویه"). These have no
facility; the contact phone is the key field.

- Model: TalentListing (role, person name, years, licensed, city/district,
  area note, availability, gender, comp, phone) + ListingKind.Talent +
  RawListing.LinkedTalentId + DbSet/relations/indexes + EF migration.
- Parser: detect آماده‌به‌کار/جویای کار → Kind=Talent; extract person name,
  years of experience, licensed flag, area («منطقه ۱»), phone. Facility
  name extraction now skipped for talent.
- Validator: talent path scores role + phone + medical (no facility/pay
  required).
- Ingestion auto-publish: creates a TalentListing for talent kind.
- Review (manual publish): Talent option + talent fields; publishes a
  TalentListing without a facility. Shift/Job facility now falls back to a
  shared «نامشخص / ثبت نشده» record when the ad names none — publishing
  never fails on a missing facility.
- Browse /Talent (indexable, filters: city/district/role/gender),
  details /Talent/Details (noindex — personal contact, tel: call button),
  _TalentCard, badge-talent, nav link, home section.
- Sitemap includes /Talent; robots disallows /Talent/Details. Archiver
  expires stale talent listings.

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

src/JobsMedical.Web/Program.cs

@@ -312,6 +312,8 @@ app.MapGet("/robots.txt", (HttpContext ctx) =>
         "Disallow: /Admin", "Disallow: /Employer", "Disallow: /Me", "Disallow: /Account",
         "Disallow: /Preferences", "Disallow: /resume/", "Disallow: /avatar/",
         "Disallow: /report", "Disallow: /push/", "Disallow: /notifications/",
+        "Disallow: /Talent/Details",   // personal contact info — list page stays indexable
+
         $"Sitemap: {b}/sitemap.xml", "");
     return Results.Text(rules, "text/plain");
 });
@@ -332,7 +334,7 @@ app.MapGet("/sitemap.xml", async (HttpContext ctx, AppDbContext db) =>
         sb.Append("<changefreq>").Append(freq).Append("</changefreq></url>\n");
     }
 
-    foreach (var p in new[] { "", "/Shifts", "/Jobs", "/Calendar", "/Facilities" })
+    foreach (var p in new[] { "", "/Shifts", "/Jobs", "/Talent", "/Calendar", "/Facilities" })
         Url($"{b}{p}", DateTime.UtcNow, p == "" ? "daily" : "hourly");
     // Static content pages (rarely change).
     foreach (var p in new[] { "/Download", "/Help", "/Privacy", "/Rules", "/Terms" })