Add medjobs.ir scraper + employer/employee choice at signup

- MedjobsListingSource: crawls medjobs.ir sitemaps (ad_listing-sitemapN) → fetches ad pages → title+description → engine (dedupe/parse/validate/publish as SEO job pages). Configured in /Admin/Settings (enable + max ads/run).
- Login/register now asks 'کادر درمان' vs 'کارفرما/مرکز': new accounts get Doctor vs FacilityAdmin role; post-login routes to /Me, /Employer, or /Admin accordingly.
- Verified live: medjobs run fetched real ads into the review queue; employer signup → /Employer.

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

src/JobsMedical.Web/Models/AppSetting.cs

@@ -49,6 +49,11 @@ public class AppSetting
     /// <summary>Divar search terms, one per line or comma-separated.</summary>
     [MaxLength(2000)] public string? DivarQueries { get; set; }
 
+    /// <summary>Scrape medjobs.ir job ads (WordPress classifieds — crawled via its sitemaps).</summary>
+    public bool MedjobsEnabled { get; set; } = false;
+    /// <summary>Max ads to fetch per ingestion run (be polite; dedupe skips already-seen).</summary>
+    public int MedjobsMaxAds { get; set; } = 40;
+
     public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
 
     /// <summary>Split a textarea (newline/comma separated) into trimmed non-empty items.</summary>