ci: registry-based releases — multi-arch images built in CI, servers only pull

- release workflow: buildx multi-arch (amd64+arm64) build+push of bot and admin images to Gitea Container Registry (git.softuniq.eu/telegram-market/telegram-shop[-admin])
- docker-compose: bot/admin use registry images (IMAGE_TAG for pinning); tor-proxy stays local alpine build
- install.sh: pull from registry instead of local docker build (no native compilation on weak hardware); interactive .env setup preserved
- new buildx runner gitea-host-buildx (label buildx) on x86_64 host
- REGISTRY_TOKEN replaced with package-scoped token (write:package)
- README/VERSION/.env.example updated

.env.example

@@ -24,6 +24,7 @@ COMMISSION_ENABLED=true
 COMMISSION_PERCENT=5
 
 # --- Commission Wallets ---
+# Начальные адреса комиссионных кошельков. Редактируются в админке (Кошельки → Edit Wallets), значения в БД имеют приоритет.
 COMMISSION_WALLET_BTC=
 COMMISSION_WALLET_LTC=
 COMMISSION_WALLET_USDT=
@@ -70,3 +71,7 @@ DEFAULT_LANGUAGE=en
 # OpenAI-совместимый endpoint и ключ (используются, если не заданы в site_settings)
 CHATBOT_API_ENDPOINT=https://api.openai.com/v1
 CHATBOT_API_KEY=
+
+# --- Deploy ---
+# Версия образов из Gitea Container Registry (по умолчанию latest)
+IMAGE_TAG=latest