feat: send order situações to Tiny for the client's WhatsApp notices

The client already sends WhatsApp notices from Tiny's order situação
(Tiny webhook -> middleware -> n8n). With TINY_STATUS_UPDATES on, a paid
order is set to "Aprovada" once and a finished pickup order to "Pronto
para envio"; pickup orders carry the client's pickup forma de envio
(TINY_FORMA_ENVIO_RETIRADA). The ready event now carries the order and
the Tiny id from the sale's receipt. Off by default until go-live, when
n8n stops sending the DTFIMP designer message.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/ROADMAP.md

@@ -308,6 +308,30 @@ From the report already sent. These are dated promises, not backlog.
   the two Têxtil modes; UV needs a product either way. The item note already
   carries the Site mode and grade. No product ids are set in production yet;
   both questions go to the client with the Mercado Pago credentials request.
+  **Customer notices through Tiny (2026-09-25, Week 3 head start):** the client
+  already sends WhatsApp notices from Tiny's order situação (Tiny webhook ->
+  the `api-tiny-n8n` middleware, which reads the order through API v2 -> n8n
+  -> WhatsApp templates): Aprovado, Pronto para envio with forma de envio `X`
+  (v2 "Customizada", their pickup), Enviado, Entregue. So the system's own
+  WhatsApp sender stays off and Tiny drives the notices. With
+  `TINY_STATUS_UPDATES=true` a paid order is created "Aberta" and set to
+  "Aprovada" (a retry finishes a half-done approval; an order already moved on
+  is left alone), and moving a pickup order to Finalizado sets "Pronto para
+  envio" by the Tiny id from the sale's receipt, searching only when it is
+  missing and retrying while the sale has not reached Tiny. Pickup orders
+  carry `TINY_FORMA_ENVIO_RETIRADA` (`tiny_probe formas-envio` lists the ids;
+  "Testar conexão" now checks it). Delivery orders get "Enviada" with 1.2.
+  Off by default: while n8n's `isDTFIMP` branch exists, "Aprovado" on a
+  `DTFIMP` product sends the designer message, and the Site's Têxtil product
+  code starts with `DTFIMP`. **Go-live together:** `TINY_ADAPTER=tiny`,
+  `TINY_STATUS_UPDATES=true`, n8n's `isDTFIMP`/"DTF Aprovado - Designer"
+  removed with "Mapear Whatsapp do Vendedor" connected to `If6`, and the
+  middleware's `numero_ecommerce` falling back to the purchase order so the
+  message shows `DTF-<n>`. **Unverified on the account:** that an API status
+  change fires Tiny's webhook, that Tiny accepts Aprovada -> Pronto para envio
+  without Faturada, and the v2 field name for the purchase order. Correção
+  necessária and Produção iniciada have no Tiny situação; client to decide
+  whether they need messages.
 - `[~]` 1.4 — Final print-file generation (see 3.2 and 3.6: production instructions
   must survive checkout before an output engine can reproduce the approved job).
   **Built (2026-09-24):** each paid item gets a PDF the width of the film and