feat(waypoint): add notes, pod_method, pod_required, and time window attributes

Mirrors the equivalent fields on the Order model so that individual
stops can carry their own proof-of-delivery requirements and
driver-facing notes independently of the parent order.

New attributes:
  - notes            Free-text driver instructions for this specific stop
  - pod_method       POD method (e.g. 'signature', 'photo', 'scan')
  - pod_required     Whether POD must be collected at this stop
  - time_window_start / time_window_end  Per-stop arrival window (date)
  - service_time     Expected dwell time in seconds

Until per-waypoint POD is fully implemented in the driver app, the
order-level pod_method / pod_required values are used as a fallback.

Author: Ronald A Richardson

addon/models/waypoint.js

@@ -21,4 +21,13 @@ export default class WaypointModel extends PlaceModel {
     @attr('string') status_code;
     @attr('string') type;
     @attr('number') order;
+    // Orchestrator time windows
+    @attr('date') time_window_start;
+    @attr('date') time_window_end;
+    @attr('number') service_time;
+    // Per-stop POD and notes (mirrors order-level fields;
+    // used as fallback until per-waypoint POD is implemented in driver app)
+    @attr('string') notes;
+    @attr('string') pod_method;
+    @attr('boolean') pod_required;
 }