fix: close price-tamper, premature rider-free, and IST/txn gaps in merged cx/handover work

Reviewed the 10 merged customer-app/base-handover commits and fixed the
defects found:

- HIGH (money): CreateCxBooking let the request body's `estimate` set the
  billed price with no server-side check; it flows into Estimatedprice →
  ridercharges (miler pay + tenant bill) with no weight re-price, so
  {min:1,max:1} settled a delivery at ₹1. Now the client estimate is honoured
  only when it matches the server quote within 15%, else the server quote
  stands.
- MED: base handover freed the rider and closed the booking-level assignment
  after the FIRST parcel of a multi-destination pickup, dropping the remaining
  stops and crediting one leg. Now finalized only when no consignment of the
  booking is still in the rider's hands.
- MED: inwardedat/completedat were written with time.Now() (UTC) instead of
  DBNow() (IST), skewing them ~5h30 vs createdat and the earnings/reconcile
  windows. Fixed in the handover, inbound-scan, reconcile and pickup-complete
  paths.
- MED: B2C customers got two "miler assigned" pushes on auto-assign (two token
  stores) and none on manual assign. Reconciled to one cxstage.Notify on both
  paths.
- LOW: ReconcileHubInbound now runs in a transaction and checks its audit
  inserts (was returning 200 with a silently-missing history row); CxLogout no
  longer reports signedOut when the token revoke fails; a rider-named handover
  base far from their reported position is rejected instead of silently
  rerouting the parcel to another city.

go build, go vet and go test ./... all pass.

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

controllers/hubController.go

@@ -561,7 +561,9 @@ func CreateInboundScan(c *fiber.Ctx) error {
 		}
 	}
 
-	now := time.Now()
+	// IST wall-clock (DBNow), so inwardedat matches createdat/updatedat and the
+	// earnings/reconciliation windows that compare against it.
+	now := utils.DBNow()
 	consignment.Status = constants.ConsignmentInwardedAtHub
 	consignment.Currenthubid = &hubID
 	consignment.Condition = req.Condition