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/Pages/Admin/Settings.cshtml.cs

@@ -30,6 +30,8 @@ public class SettingsModel : PageModel
     [BindProperty] public bool DivarEnabled { get; set; }
     [BindProperty] public string? DivarCity { get; set; }
     [BindProperty] public string? DivarQueries { get; set; }
+    [BindProperty] public bool MedjobsEnabled { get; set; }
+    [BindProperty] public int MedjobsMaxAds { get; set; } = 40;
     [TempData] public string? Saved { get; set; }
 
     public async Task OnGetAsync()
@@ -52,6 +54,8 @@ public class SettingsModel : PageModel
         DivarEnabled = s.DivarEnabled;
         DivarCity = s.DivarCity;
         DivarQueries = s.DivarQueries;
+        MedjobsEnabled = s.MedjobsEnabled;
+        MedjobsMaxAds = s.MedjobsMaxAds;
     }
 
     public async Task<IActionResult> OnPostAsync()
@@ -75,6 +79,8 @@ public class SettingsModel : PageModel
             DivarEnabled = DivarEnabled,
             DivarCity = DivarCity,
             DivarQueries = DivarQueries,
+            MedjobsEnabled = MedjobsEnabled,
+            MedjobsMaxAds = MedjobsMaxAds,
         });
         Saved = "تنظیمات ذخیره شد.";
         return RedirectToPage();