feat(payment): first-class transaction_id when recording a règlement

Make the originating bank transaction id a first-class input on payment-record.sh
so every règlement is tied to the real bank movement at write time.

- `transaction_id` is the canonical field (the Qonto/Wise feed tx id); `num` stays
  as a back-compat alias. It's stored on the payment's bank line (llx_bank.num_chq),
  the reconciliation key.
- Recording WITHOUT a transaction_id prints a stderr warning (still posts, but won't
  auto-reconcile) — nudges the agent to always carry it.
- Output normalises to {id, bank_transaction_id, transaction_id}.
- Promote: manifests' payment ops carry transaction_id; promote-plan shows it
  (tx=… or tx=MISSING).

Proven live: customer + supplier record with transaction_id; the `num` alias maps
to the same field; the no-tx warning fires; promote plan/apply carry it through.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/skills/dolibarr-sandbox-write/scripts/promote-plan.sh

@@ -31,8 +31,10 @@ for i, op in enumerate(ops, 1):
             print("         - %r qty=%s pu_ht=%s tva=%s%%" % (ln.get("desc", ""), ln.get("qty", 1),
                   ln.get("price_ht", ln.get("subprice")), ln.get("tva", ln.get("tva_tx", 20))))
     elif t == "payment":
-        print("       invoice=%s mode=%s account=%s %s" % (inp.get("invoice_id"), inp.get("mode", "VIR"),
-              inp.get("account_id"), ("amount=%s" % inp["amount"]) if inp.get("amount") else "(full)"))
+        txid = inp.get("transaction_id") or inp.get("num")
+        print("       invoice=%s mode=%s account=%s %s%s" % (inp.get("invoice_id"), inp.get("mode", "VIR"),
+              inp.get("account_id"), ("amount=%s" % inp["amount"]) if inp.get("amount") else "(full)",
+              (" tx=%s" % txid) if txid else " tx=MISSING"))
 print("\nNext:")
 print("  promote-apply.sh <manifest> --target sandbox   # rehearse the replay (safe)")
 print("  promote-apply.sh <manifest> --target prod      # WRITES PROD — needs DOLIBARR_PROD_WRITE_KEY")