ui: P2R-09 auto-init UX — init line in chrome + danger-zone re-init

Latest 'init' job status surfaced under the host-detail vitals strip
(succeeded/failed/running/queued, with link to the live job log on
non-success). New POST /hosts/{id}/repo/reinit handler dispatches a
fresh init job after the operator types the host name to confirm;
audit row records 'host.repo_reinit'.

internal/server/http/ui_handlers.go

@@ -499,6 +499,12 @@ type hostChromeData struct {
 	SourceGroupCount int
 	ScheduleCount    int
 	ScheduleVersion  int64 // host_schedule_version (latest desired)
+
+	// Auto-init status surfaced from the latest 'init' job.
+	// InitStatus is "succeeded" | "failed" | "running" | "queued" | "" (never run).
+	InitStatus string
+	InitAt     *time.Time // started_at if non-nil else created_at
+	InitJobID  string
 }
 
 // loadHostChrome fetches the per-tab counts that every host-detail tab
@@ -520,6 +526,15 @@ func (s *Server) loadHostChrome(r *stdhttp.Request, host store.Host, subtab, cru
 	if v, err := s.deps.Store.GetHostScheduleVersion(r.Context(), host.ID); err == nil {
 		d.ScheduleVersion = v
 	}
+	if j, err := s.deps.Store.LatestJobByKind(r.Context(), host.ID, "init"); err == nil && j != nil {
+		d.InitStatus = j.Status
+		d.InitJobID = j.ID
+		t := j.CreatedAt
+		if j.StartedAt != nil {
+			t = *j.StartedAt
+		}
+		d.InitAt = &t
+	}
 	return d
 }