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

internal/assignment/crm_assignment.go

@@ -8,6 +8,7 @@ import (
 
 	"doormile/constants"
 	"doormile/db"
+	"doormile/internal/routing"
 	"doormile/models"
 	"doormile/utils"
 
@@ -240,6 +241,10 @@ func commitAssignment(booking *models.PickupBooking, candidate *milerCandidate,
 	notifyMilerNewAssignment(candidate.profile, booking.Bookingid)
 	notifyCustomerMilerAssigned(booking, candidate.profile.Displayname)
 
+	// Order the rider's stops now this one is added. No-op below two active stops;
+	// best-effort and off this goroutine's critical path.
+	routing.SequenceMilerStopsAsync(milerUserID)
+
 	return nil
 }
 

internal/assignment/customer_assignment.go

@@ -9,6 +9,7 @@ import (
 
 	"doormile/constants"
 	"doormile/db"
+	"doormile/internal/routing"
 	"doormile/models"
 	"doormile/utils"
 )
@@ -240,6 +241,10 @@ func commitCustomerAssignment(
 	notifyMilerNewAssignment(miler.profile, booking.Bookingid)
 	notifyCustomerMilerAssigned(booking, miler.profile.Displayname)
 
+	// Order the rider's stops now this one is added. No-op below two active stops;
+	// best-effort and off this goroutine's critical path.
+	routing.SequenceMilerStopsAsync(milerUserID)
+
 	return nil
 }