feat(telegram): promo deep-link seeds English Scrabble for new users

The promo bot button carries a configurable variant-seed start-param (default verudit_ru-scrabble_en). The gateway parses start_param from the validated initData and forwards it; the backend, on first contact only, seeds the new account variant_preferences from it (English Scrabble alongside the default Erudit). No schema change (the scrabble_en CHECK is already in the baseline) and the gateway<->backend REST field is additive, so the rolling deploy is safe in either order. TELEGRAM_PROMO_START_PARAM configures the payload (empty forwards the user own /start payload). Covered by account unit tests, a gateway transcode test, and an integration test asserting new-only seeding.
2026-06-23 21:51:52 +02:00
parent c02262fcf7
commit 03dfc29a54
16 changed files with 260 additions and 24 deletions
@@ -253,8 +253,9 @@ merge".

 **Preferences (which variants you can be matched into).** A profile setting picks the game
 variants — Erudite, Russian Scrabble and English Scrabble, shown **Erudite-first** — you allow
-yourself to be matched into; a **new account starts with Erudite only**, and you must keep **at
-least one** selected. This list is exactly what **New Game** offers when you start a game
+yourself to be matched into; a **new account starts with Erudite only** — unless it was created
+through the **promo bot's deep link**, which also enables **English Scrabble** — and you must keep
+**at least one** selected. This list is exactly what **New Game** offers when you start a game
 (auto-match, an AI game, or a friend invitation you create) — a variant you have not enabled is
 not offered, and the server refuses it. It does not restrict games you are **invited** to: an
 invited friend may accept an invitation in **any** variant, and you can always open and play