Add iranestekhdam.ir as an ingestion source (clinical job ads at named facilities)

New IranEstekhdamListingSource: reads the site monthly ad sitemaps
(sitemap-ads.xml -> sitemap-ads-YYYY-M.xml), keeps only ad URLs whose Persian slug names a
clinical role (veterinary/non-clinical excluded), then extracts each ad title + description
(+ phone). These are employer ads at NAMED facilities, so they directly improve the
unknown-facility problem the classifieds content has.

Wired in like Medjobs: AppSetting toggles (IranEstekhdamEnabled/MaxAds/UseProxy) + EF
migration, SettingsService persistence, admin Settings UI, and DI registration. Off by
default; the medical-gate validator + AI auditor + junk filters screen results downstream.

Note: e-estekhdam / jobinja / jobvision are JS-rendered SPAs whose ad lists are not in static
HTML, so they need API reverse-engineering (a separate effort), not this static-scrape path.

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

src/JobsMedical.Web/Pages/Admin/Settings.cshtml

@@ -147,6 +147,16 @@
                         </div>
                     </div>
 
+                    <div class="source-box">
+                        <label class="toggle-row">
+                            <input type="checkbox" name="IranEstekhdamEnabled" value="true" checked="@Model.IranEstekhdamEnabled" />
+                            <span class="t-body"><span>🏥 ایران‌استخدام (iranestekhdam.ir)</span><span class="t-hint">آگهی‌های استخدامِ مراکز درمانیِ نام‌دار از سایت‌مپِ ماهانه؛ فقط نقش‌های بالینی.</span></span>
+                        </label>
+                        <div class="filter-group"><label>حداکثر آگهی در هر اجرا</label><input type="number" name="IranEstekhdamMaxAds" min="1" max="500" value="@Model.IranEstekhdamMaxAds" dir="ltr" />
+                            <label class="proxy-toggle"><input type="checkbox" name="IranEstekhdamUseProxy" value="true" checked="@Model.IranEstekhdamUseProxy" /> 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" />