v3.18.33 — Fix: MoMo claim & reservation guest 403s

Extends retry-with-fresh-nonce to dd_momo_claim_paid, dd_submit_reservation, dd_reservation_claim_deposit, dd_reservation_pesapal_start — all confirmed idempotent or nonce-checked-before-write. dd_place_order intentionally excluded: a concrete duplicate-order path exists in the online-payment branch, unsafe to retry without an idempotency key first (tracked for a future release). See RELEASE.md.