Add medboom.ir as an ingestion source (doctor/dentist-heavy, VPN-free)

New MedboomListingSource: a WordPress medical-classifieds board crawled like medjobs
(wp-sitemap.xml -> posts-post-N.xml, newest first), filtered to clinical-role slugs and
Tehran-only for launch. medboom skews toward doctors/dentists/pharmacists and carries both
hiring and availability posts, so it directly broadens the role mix the nurse-heavy Divar
content lacks. Iranian-hosted -> no proxy/VPN needed (relevant now that Telegram is off).

Wired like the other sources: AppSetting toggles (MedboomEnabled/MaxAds/UseProxy) + EF
migration, SettingsService persistence, admin Settings UI, DI registration. Off by default.
Validated against live data: Tehran clinical ads at named clinics (pharmacy/dental/etc.).

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

src/JobsMedical.Web/Services/Scraping/SettingsService.cs

@@ -58,6 +58,9 @@ public class SettingsService
         s.IranEstekhdamEnabled = incoming.IranEstekhdamEnabled;
         s.IranEstekhdamMaxAds = Math.Clamp(incoming.IranEstekhdamMaxAds, 1, 500);
         s.IranEstekhdamUseProxy = incoming.IranEstekhdamUseProxy;
+        s.MedboomEnabled = incoming.MedboomEnabled;
+        s.MedboomMaxAds = Math.Clamp(incoming.MedboomMaxAds, 1, 500);
+        s.MedboomUseProxy = incoming.MedboomUseProxy;
         s.SmsEnabled = incoming.SmsEnabled;
         s.SmsApiKey = incoming.SmsApiKey?.Trim();
         s.SmsTemplate = incoming.SmsTemplate?.Trim();