Contact reveal modal: click phone/contact on cards and detail pages

Adds a lazy-loaded contact modal. Any element with data-contact-type +
data-contact-id (the «📞 تماس» button on shift/job/talent/recommendation cards,
and the contact CTA on the three detail pages) opens a modal that fetches the
listing's numbers from a new GET /contact endpoint and renders them with click-
to-call links. Numbers are loaded only on click, so they never sit in list-page
HTML (privacy / anti-scrape). The endpoint logs the same Apply interest signal
for shift/job that the old inline-reveal POST did, and falls back to the
facility phone (or Divar source link for talent) when an ad has no own contacts.

Verified locally: GET /contact?type=shift&id=1 → {title, contacts:[{value:
'021-82032000', href:'tel:...'}]}, and the modal opens and renders on the shift
detail page.

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

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

@@ -119,10 +119,8 @@
                     <div class="alert alert-success" style="margin-bottom:12px;">✓ این فرصت ذخیره شد و در پیشنهادهای شما لحاظ می‌شود.</div>
                 }
                 <div class="aside-apply">
-                    <form method="post">
-                        <button type="submit" asp-page-handler="Interest" asp-route-id="@s.Id"
-                                class="btn btn-accent btn-block btn-lg">اعلام تمایل و مشاهده راه ارتباطی</button>
-                    </form>
+                    <button type="button" class="btn btn-accent btn-block btn-lg contact-trigger"
+                            data-contact-type="shift" data-contact-id="@s.Id">📞 اعلام تمایل و مشاهده راه ارتباطی</button>
                     <p class="muted center" style="font-size:12px; margin:8px 0;">با اعلام تمایل، اطلاعات تماس مرکز نمایش داده می‌شود.</p>
                 </div>
                 <div style="display:flex; gap:8px;">
@@ -196,26 +194,11 @@
 
 @* Sticky bottom action bar — mobile only. Always-reachable primary action (native-app feel). *@
 <div class="mobile-action-bar">
-    @if (Model.ShowContact)
-    {
-        @if (!string.IsNullOrEmpty(f.Phone))
-        {
-            <a class="btn btn-accent btn-lg cta-main" href="tel:@f.Phone">📞 تماس با مرکز</a>
-        }
-        else
-        {
-            <span class="cta-main center muted" style="align-self:center;">اطلاعات تماس در بالای صفحه</span>
-        }
-    }
-    else
-    {
-        <form method="post" class="cta-main">
-            <button type="submit" asp-page-handler="Interest" asp-route-id="@s.Id" class="btn btn-accent btn-block btn-lg">اعلام تمایل و مشاهده تماس</button>
-        </form>
-        <form method="post">
-            <button type="submit" asp-page-handler="Save" asp-route-id="@s.Id" class="btn btn-outline btn-lg" aria-label="ذخیره" title="ذخیره">♡</button>
-        </form>
-    }
+    <button type="button" class="btn btn-accent btn-lg cta-main contact-trigger"
+            data-contact-type="shift" data-contact-id="@s.Id">📞 اعلام تمایل و مشاهده تماس</button>
+    <form method="post">
+        <button type="submit" asp-page-handler="Save" asp-route-id="@s.Id" class="btn btn-outline btn-lg" aria-label="ذخیره" title="ذخیره">♡</button>
+    </form>
 </div>
 
 @if (!string.IsNullOrEmpty(Model.MapKey) && Model.Shift?.Facility?.Lat is not null)