Ingestion data-quality + map fixes: AI salary, geocode coverage, in-place backfill & purge

- Jobs now keep the AI-extracted salary (d.PayAmount ?? parsed.PayAmount); they
  previously used only the parser figure, so every aggregated opening showed «توافقی».
- Geocoder also scans the ad body, so Tehran ads that name a neighbourhood only in
  free text («… در سهروردی») get an approximate map point.
- New BackfillCoordsAsync (+ admin button): fills missing coords on existing aggregated
  listings from their stored text, in place — no ID/URL churn, SEO-safe.
- New PurgeInvalidAggregatedAsync + DedupeJobsAsync (+ admin button): in-place removal of
  out-of-scope (domestic/promo/spam) aggregated jobs/shifts and duplicate job reposts,
  keeping valid listings' IDs.
- Jobs detail page always renders the location card (matches Shifts) instead of hiding it
  when coords are missing.

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

src/JobsMedical.Web/Pages/Jobs/Details.cshtml

@@ -161,12 +161,12 @@
                 }
             </div>
 
-            @if (mapLat is not null && mapLng is not null)
-            {
-                var latS = mapLat.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
-                var lngS = mapLng.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
-                <div class="card card-pad" style="margin-top:16px;">
-                    <h3 style="margin-top:0;">موقعیت مکانی</h3>
+            <div class="card card-pad" style="margin-top:16px;">
+                <h3 style="margin-top:0;">موقعیت مکانی</h3>
+                @if (mapLat is not null && mapLng is not null)
+                {
+                    var latS = mapLat.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
+                    var lngS = mapLng.Value.ToString(System.Globalization.CultureInfo.InvariantCulture);
                     @if (!string.IsNullOrEmpty(Model.MapKey))
                     {
                         <div id="facmap" data-lat="@latS" data-lng="@lngS" data-approx="@(mapApprox ? "true" : "false")" style="height:200px; border-radius:10px; overflow:hidden; border:1px solid var(--line);"></div>
@@ -183,8 +183,12 @@
                     }
                     <a class="btn btn-outline btn-block" style="margin-top:8px;" target="_blank" rel="noopener"
                        href="https://neshan.org/maps/@(latS),@(lngS),16z">مسیریابی در نشان</a>
-                </div>
-            }
+                }
+                else
+                {
+                    <p class="muted" style="margin:0;">مختصات این آگهی ثبت نشده است.</p>
+                }
+            </div>
         </aside>
     </div>
 </div>