[Applications] Applicant pipeline: employer accept/reject + status to applicant

InterestEvent gains a Status (ApplicationStatus: Interested→Accepted/Rejected; migration, default Interested). Employer/Listings shows each applicant's status with پذیرفتن/رد buttons (ownership-checked handlers update the status and notify the applicant via bell/SSE/push linking to the listing). The کارجو panel (/Me) now shows a status badge (در انتظار بررسی / پذیرفته شد / رد شد) on each applied shift/job. Reusable _ApplicantRow partial for the employer list.

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

src/JobsMedical.Web/Models/InterestEvent.cs

@@ -31,5 +31,9 @@ public class InterestEvent
 
     public InterestEventType EventType { get; set; }
 
+    /// <summary>For Apply events: the application status the employer/applicant sees
+    /// (Interested = new/pending → Accepted/Rejected by the employer, Withdrawn by the applicant).</summary>
+    public ApplicationStatus Status { get; set; } = ApplicationStatus.Interested;
+
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
 }