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
@@ -204,7 +204,7 @@ arrive from a platform rather than completing a mandatory registration).
 > recipient's interface language (`preferred_language`), with no per-bot routing. New
 > Game variant gating moved off the login language onto a per-user profile setting
 > `variant_preferences` (default Erudit only, server-enforced on the caller's create
-> paths; an invited friend may still accept any variant). The per-bot env vars and
+> paths; an invited friend may still accept any variant, and a Telegram **promo deep-link** seeds extra variants — e.g. English Scrabble — onto a brand-new account via the validated `start_param`). The per-bot env vars and
 > `GATEWAY_DEFAULT_SUPPORTED_LANGUAGES` were removed; the wire dropped
 > `service_language`/`supported_languages` and the push `language` routing field, and
 > gained `variant_preferences` on Profile/UpdateProfile.