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/Employer/PostJob.cshtml.cs

@@ -15,12 +15,14 @@ public class PostJobModel : PageModel
     private readonly AppDbContext _db;
     private readonly CaptchaService _captcha;
     private readonly SubmissionGuard _guard;
+    private readonly NotificationService _notify;
 
-    public PostJobModel(AppDbContext db, CaptchaService captcha, SubmissionGuard guard)
+    public PostJobModel(AppDbContext db, CaptchaService captcha, SubmissionGuard guard, NotificationService notify)
     {
         _db = db;
         _captcha = captcha;
         _guard = guard;
+        _notify = notify;
     }
 
     public List<Facility> MyFacilities { get; private set; } = new();
@@ -68,7 +70,7 @@ public class PostJobModel : PageModel
         if (await _guard.PostingRateExceededAsync(uid))
         { Error = $"در یک ساعت اخیر بیش از حد مجاز ({SubmissionGuard.MaxListingsPerHour}) آگهی ثبت کرده‌اید. بعداً تلاش کنید."; NewCaptcha(); return Page(); }
 
-        _db.JobOpenings.Add(new JobOpening
+        var job = new JobOpening
         {
             FacilityId = FacilityId,
             RoleId = RoleId,
@@ -81,8 +83,10 @@ public class PostJobModel : PageModel
             Requirements = Requirements,
             Status = ShiftStatus.Open,
             Source = ShiftSource.Direct,
-        });
+        };
+        _db.JobOpenings.Add(job);
         await _db.SaveChangesAsync();
+        await _notify.NotifyNewJobAsync(job.Id);   // notify matching staff
         return RedirectToPage("/Employer/Index");
     }
 

src/JobsMedical.Web/Pages/Employer/PostShift.cshtml.cs

@@ -15,12 +15,14 @@ public class PostShiftModel : PageModel
     private readonly AppDbContext _db;
     private readonly CaptchaService _captcha;
     private readonly SubmissionGuard _guard;
+    private readonly NotificationService _notify;
 
-    public PostShiftModel(AppDbContext db, CaptchaService captcha, SubmissionGuard guard)
+    public PostShiftModel(AppDbContext db, CaptchaService captcha, SubmissionGuard guard, NotificationService notify)
     {
         _db = db;
         _captcha = captcha;
         _guard = guard;
+        _notify = notify;
     }
 
     public List<Facility> MyFacilities { get; private set; } = new();
@@ -72,7 +74,7 @@ public class PostShiftModel : PageModel
         { Error = $"در یک ساعت اخیر بیش از حد مجاز ({SubmissionGuard.MaxListingsPerHour}) آگهی ثبت کرده‌اید. بعداً تلاش کنید."; NewCaptcha(); return Page(); }
 
         var role = await _db.Roles.FindAsync(RoleId);
-        _db.Shifts.Add(new Shift
+        var shift = new Shift
         {
             FacilityId = FacilityId,
             RoleId = RoleId,
@@ -89,8 +91,10 @@ public class PostShiftModel : PageModel
             GenderRequirement = GenderRequirement,
             Status = ShiftStatus.Open,
             Source = ShiftSource.Direct, // posted directly by the facility
-        });
+        };
+        _db.Shifts.Add(shift);
         await _db.SaveChangesAsync();
+        await _notify.NotifyNewShiftAsync(shift.Id);   // notify matching staff
         return RedirectToPage("/Employer/Index");
     }