Notify matching users when a new shift/job is posted (in-app notifications)

- Notification entity + NotificationService: on publish, notify users whose saved prefs match the listing (role/city/+shift type); users with no preference aren't spammed
- Wired into PostShift, PostJob, and Admin Review publish
- 🔔 bell with unread count in the header (@inject) + /Me/Notifications page (mark-all-read on open)
- Reliable in-app delivery (works in Iran without FCM); Web Push can ride the same records later
- Verified: employee pref → employer posts matching shift → employee bell=۱ + 'شیفت جدید: پزشک عمومی'

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

src/JobsMedical.Web/Pages/Admin/Review.cshtml.cs

@@ -13,11 +13,13 @@ public class ReviewModel : PageModel
 {
     private readonly AppDbContext _db;
     private readonly IListingParser _parser;
+    private readonly NotificationService _notify;
 
-    public ReviewModel(AppDbContext db, IListingParser parser)
+    public ReviewModel(AppDbContext db, IListingParser parser, NotificationService notify)
     {
         _db = db;
         _parser = parser;
+        _notify = notify;
     }
 
     public RawListing? Raw { get; private set; }
@@ -75,6 +77,8 @@ public class ReviewModel : PageModel
         Raw = await _db.RawListings.FirstOrDefaultAsync(r => r.Id == id);
         if (Raw is null) return NotFound();
 
+        Shift? createdShift = null;
+        JobOpening? createdJob = null;
         if (Kind == ListingKind.Shift)
         {
             var role = await _db.Roles.FindAsync(RoleId);
@@ -101,6 +105,7 @@ public class ReviewModel : PageModel
             await _db.SaveChangesAsync();
             Raw.Status = RawListingStatus.Normalized;
             Raw.LinkedShiftId = shift.Id;
+            createdShift = shift;
         }
         else
         {
@@ -120,8 +125,11 @@ public class ReviewModel : PageModel
             };
             _db.JobOpenings.Add(job);
             Raw.Status = RawListingStatus.Normalized;
+            createdJob = job;
         }
         await _db.SaveChangesAsync();
+        if (createdShift is not null) await _notify.NotifyNewShiftAsync(createdShift.Id);
+        if (createdJob is not null) await _notify.NotifyNewJobAsync(createdJob.Id);
         return RedirectToPage("/Admin/Index");
     }