feat: miler delivery-leg fixes — consignmentid, auto route sequencing, admin consignment status

Miler app P0 + contract gaps found in the live audit:

- GET /miler/bookings now returns consignmentid + consignmentstatus on every
  row (nullable), so the app can call deliver/skip/start-delivery straight from
  the list. /miler/assignments is the active-only queue, so this is the
  authoritative fix for stops that have moved onto the delivery leg.
- GET /miler/bookings now returns sequencedat per row: non-null means the
  console/optimizer fixed this stop's order and the app follows step exactly;
  null means no route assigned and the app may fall back to nearest-first.
- Route sequencing (internal/routing) now runs automatically after every
  assignment — customer auto-assign, express auto-assign, manual assign, and
  accept — via SequenceMilerStopsAsync (fire-and-forget, no-op below two active
  stops). Previously only hub batch-assign sequenced, so most riders saw step=0.
- GET /admin/bookings now surfaces the live consignmentstatus alongside the
  frozen booking status, so a Converted_To_Consignment booking can still show
  Out_for_Delivery / Delivered instead of a generic "Active".

Two-step hyperlocal flow (Arrived_At_Pickup, Collected_By_Miler, start-delivery)
stays gated behind MILER_COLLECTED_STATE_ENABLED (default off) until the app
ships; consignmentid/status, GET /miler/consignments/:id, stable error codes and
Idempotency-Key handling are unconditional and safe on the current app.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WRaFH5hMRqmUQvVPQsyjZD

controllers/adminController.go

@@ -2086,6 +2086,32 @@ func GetAdminBookings(c *fiber.Ctx) error {
 		return utils.Internal(c, "failed to fetch bookings")
 	}
 
+	// Surface the live consignment status next to the booking. Once a booking is
+	// picked up its own status stops moving (it sits at Converted_To_Consignment),
+	// while the parcel keeps advancing on the consignment — Out_for_Delivery,
+	// Delivered. Without this the console can only show the frozen booking status
+	// and a collected order reads as a generic "Active". Batched: one IN query for
+	// the whole page, not one per row.
+	consignmentIDs := make([]int, 0, len(bookings))
+	for _, b := range bookings {
+		if b.Consignmentid != nil {
+			consignmentIDs = append(consignmentIDs, *b.Consignmentid)
+		}
+	}
+	if len(consignmentIDs) > 0 {
+		var consignments []models.Consignment
+		db.DB.Select("consignmentid, status").Where("consignmentid IN ?", consignmentIDs).Find(&consignments)
+		statusByConsignment := make(map[int]string, len(consignments))
+		for _, cn := range consignments {
+			statusByConsignment[cn.Consignmentid] = cn.Status
+		}
+		for i := range bookings {
+			if bookings[i].Consignmentid != nil {
+				bookings[i].Consignmentstatus = statusByConsignment[*bookings[i].Consignmentid]
+			}
+		}
+	}
+
 	pages := int(math.Ceil(float64(total) / float64(pagesize)))
 
 	return c.JSON(fiber.Map{