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
@@ -51,6 +51,7 @@ TELEGRAM_SUPPORT_CHAT_ID=              # private forum supergroup for the suppor
 TELEGRAM_PROMO_BOT_TOKEN=             # optional standalone promo bot token; empty disables it
 TELEGRAM_BOT_USERNAME=               # main bot @username without the @ (promo message); required when the promo token is set
 TELEGRAM_BOT_LINK=                    # main bot Mini App link for the promo button (reuse VITE_TELEGRAM_LINK); required when the promo token is set
+TELEGRAM_PROMO_START_PARAM=           # promo button startapp payload — a variant-seed deep link (default verudit_ru-scrabble_en) adding English Scrabble for new users; empty forwards the user's /start payload
 TELEGRAM_MINIAPP_URL=                  # required
 TELEGRAM_TEST_ENV=false
 TELEGRAM_API_BASE_URL=