fix: per-site attribution needs its own column, not pickuplocationid

Caught by testing the previous commit against production: creating a booking
with a resolved site failed with

  pickupbookings_pickuplocationid_fkey
  FOREIGN KEY (pickuplocationid) REFERENCES appcustomerlocations(...)

pickuplocationid is the *customer's* saved address, a B2C concept. It never
referred to the client company's own kitchens or branches. The pre-existing
code that validated an incoming pickuplocationid against TenantLocation was
wrong on the same point and would have 500'd for any caller that used it — it
had simply never been called with a value.

Adds tenantlocationid to pickupbookings and consignments (nullable, indexed,
additive via AutoMigrate), carried across at pickup, and points the reporting
filter, the by_location breakdown and the Unattributed bucket at it.

The booking request accepts tenantlocationid, and still accepts
pickuplocationid as an alias so anything written against the earlier docs
starts working instead of failing.

Also gofmt on the two model files touched; booking.go was already failing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

controllers/milerController.go

@@ -804,6 +804,7 @@ func BookingPickupComplete(c *fiber.Ctx) error {
 		Trackingno:          trackingNo,
 		Tenantid:            consignmentTenantID,
 		Pickuplocationid:    booking.Pickuplocationid,
+		Tenantlocationid:    booking.Tenantlocationid,
 		Pickuplatitude:      booking.Pickuplatitude,
 		Pickuplongitude:     booking.Pickuplongitude,
 		Deliverylatitude:    booking.Deliverylatitude,