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/Pages/Admin/Settings.cshtml

@@ -157,6 +157,16 @@
                         </div>
                     </div>
 
+                    <div class="source-box">
+                        <label class="toggle-row">
+                            <input type="checkbox" name="MedboomEnabled" value="true" checked="@Model.MedboomEnabled" />
+                            <span class="t-body"><span>🩺 مدبوم (medboom.ir)</span><span class="t-hint">آگهی‌های علوم پزشکی (بیشتر پزشک/دندانپزشک)، استخدام و آماده‌به‌کار؛ بدون نیاز به فیلترشکن.</span></span>
+                        </label>
+                        <div class="filter-group"><label>حداکثر آگهی در هر اجرا</label><input type="number" name="MedboomMaxAds" min="1" max="500" value="@Model.MedboomMaxAds" dir="ltr" />
+                            <label class="proxy-toggle"><input type="checkbox" name="MedboomUseProxy" value="true" checked="@Model.MedboomUseProxy" /> از پروکسی استفاده شود</label>
+                        </div>
+                    </div>
+
                     <div class="source-box">
                         <label class="toggle-row">
                             <input type="checkbox" name="WebsitesEnabled" value="true" checked="@Model.WebsitesEnabled" />