Admin suite: monitoring dashboard, user management/ban, broadcast, reports, SMS test

- /Admin/Overview: platform monitoring stats (users by role, facilities, listings, applies, push subs, queue, reports, bans)
- /Admin/Users: search/filter + ban/unban (User.IsBanned + reason); banned users blocked at login
- /Admin/Broadcast: send announcement (in-app + web push) to all / staff / employers via NotificationService
- Reports: report button on shift/job detail → /report endpoint → /Admin/Reports (resolve/dismiss)
- Settings: 'send test SMS' button; admin cross-nav links; SMS API config already in place
- migration AdminBanReports; verified overview/users/broadcast/report persist

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

src/JobsMedical.Web/Models/Report.cs

@@ -0,0 +1,22 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace JobsMedical.Web.Models;
+
+/// <summary>A user-submitted report against a listing/facility/user (abuse, fake, wrong info).</summary>
+public class Report
+{
+    public int Id { get; set; }
+
+    public ReportTargetType TargetType { get; set; }
+    public int TargetId { get; set; }
+    [MaxLength(160)] public string? TargetLabel { get; set; }   // snapshot for the admin list
+
+    [Required, MaxLength(500)]
+    public string Reason { get; set; } = "";
+
+    public int? ReporterUserId { get; set; }
+    [MaxLength(36)] public string? ReporterVisitorId { get; set; }
+
+    public ReportStatus Status { get; set; } = ReportStatus.Open;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}