[commerce] stub out commerce, for historical purposes

apps/commerce/README.md

@@ -6,12 +6,20 @@ A Cloudflare Workers application using Hono
 
 - `GET /purchase/v1/hasspentmoney` — whether the player has ever spent money;
   `false`.
+- `POST /purchase/v1/initiatepurchase` — begins a purchase, answering
+  `{ "transactionId": 1234567890 }`. Nothing is charged and no transaction is
+  recorded, so the id is a fixed placeholder and the posted body is ignored.
 - `GET /api/catalog/v1/all` — the purchasable SKU catalog (token packs, special
   offers), served from the bundled `static/catalog-v1-all.json`. The client's
   `?onlyAvailableSkus=true` is accepted and ignored: the bundled catalog already
   contains only available SKUs.
 - `GET /purchasecampaign/allcurrent/v2` — current purchase campaigns
   (limited-time offers/promos); `[]` (none active).
+- `GET /reminder/currentTokenBundles/v2` — token-bundle purchase reminders (the
+  "buy more tokens" nudge); `[]` (none to show).
+- `GET /openapi.json` — the generated OpenAPI 3.1 spec for the routes above.
+  Descriptive only; nothing is validated against it. Also aggregated into the
+  docs UI on `www` at `/docs`.
 
 ## Development