chore(deploy): dedupe & regroup Gitea CI variables/secrets

Collapse identical TEST_/PROD_ pairs to single unprefixed Gitea entries, derive
the public URLs from PUBLIC_BASE_URL at deploy time, and share the prod env.sh
renderer between deploy and rollback.

- Collapse to one unprefixed variable: DICT_VERSION, SMTP_RELAY_HOST/PORT/TLS,
  GRAFANA_SMTP_PORT, VITE_VK_APP_LINK, VITE_VK_APP_ID (one Selectel relay + one
  pair of VK apps serve every contour). Secrets collapsed by the owner:
  SMTP_RELAY_USER/PASS, GATEWAY_VK_APP_SECRET, GATEWAY_VK_ID_CLIENT_SECRET.
- Derive at deploy from PUBLIC_BASE_URL (no longer stored): TELEGRAM_MINIAPP_URL,
  GRAFANA_ROOT_URL, VITE_VK_ID_REDIRECT_URL. Removes the prod/test asymmetry and
  fills the missing test VITE_VK_APP_ID (VK web login was half-configured on test).
- Extract deploy/write-prod-env.sh + write-prod-bot-env.sh, shared by prod-deploy
  and prod-rollback so the two cannot drift: a rollback now re-renders the FULL
  runtime env (email / VK login / Grafana alerts previously went dark after a
  rollback) and passes TELEGRAM_SUPPORT_CHAT_ID.
- Single-source DICT_VERSION (CI env + both deploys), fix the v1.3.0/v1.3.1 drift in
  .env.example/README, correct the misleading honeytoken/abuse-ban compose comment,
  and rewrite the deploy/README variable list (+ the previously undocumented
  GATEWAY_VK_APP_SECRET and TELEGRAM_SUPPORT_CHAT_ID).

The Gitea variables are reworked via the API; the stale TEST_/PROD_ entries are
deleted after the test contour goes green.

deploy/write-prod-env.sh

@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+# Render the prod main-host runtime env.sh from the workflow job environment.
+#
+# Sourced identically by prod-deploy (deploy-main) and prod-rollback
+# (rollback-main) so the two paths cannot drift: a rollback recreates the
+# containers, so it must re-render the SAME runtime env a full deploy does —
+# otherwise transactional email, VK login and Grafana alerts silently go dark
+# after a rollback until the next full deploy.
+#
+# Usage:  APP_VERSION=<tag> bash deploy/write-prod-env.sh <out-path>
+#
+# Every other value comes from the caller's environment (the job `env:` block,
+# vars.* / secrets.*). Mirrors the compose interpolation contract in
+# deploy/.env.example; keep in sync with deploy/docker-compose{,.prod}.yml.
+out="${1:?usage: write-prod-env.sh <out-path>}"
+
+# Derive the public URLs from the one canonical origin instead of storing each
+# under its own variable. The path suffixes are structural (SPA routes / the
+# Caddy /_gm sub-path), identical on every contour.
+base="${PUBLIC_BASE_URL%/}"
+TELEGRAM_MINIAPP_URL="$base/telegram/"
+GRAFANA_ROOT_URL="$base/_gm/grafana/"
+VITE_VK_ID_REDIRECT_URL="$base/app/"
+
+# Grafana needs a BARE from-address (it rejects the "Name" <addr> form the backend
+# go-mail accepts, and validates it even when SMTP is disabled — a bad value
+# crash-loops Grafana). Split the display-format SERVICE From into address + name;
+# the backend keeps the full form.
+svc_from="${SMTP_RELAY_SERVICE_FROM:-}"
+GRAFANA_SMTP_FROM_NAME=''
+case "$svc_from" in
+  *"<"*">"*)
+    GRAFANA_SMTP_FROM_ADDRESS="$(printf '%s' "$svc_from" | sed -E 's/.*<([^>]+)>.*/\1/')"
+    GRAFANA_SMTP_FROM_NAME="$(printf '%s' "$svc_from" | sed -E 's/[[:space:]]*<[^>]*>.*$//; s/^"//; s/"$//')" ;;
+  *) GRAFANA_SMTP_FROM_ADDRESS="$svc_from" ;;
+esac
+
+cat > "$out" <<EOF
+export REGISTRY='$REGISTRY'
+export SCRABBLE_CONFIG_DIR='/opt/scrabble'
+export POSTGRES_DB='${POSTGRES_DB:-scrabble}'
+export POSTGRES_USER='${POSTGRES_USER:-scrabble}'
+export POSTGRES_PASSWORD='$POSTGRES_PASSWORD'
+export GM_BASICAUTH_USER='${GM_BASICAUTH_USER:-gm}'
+export GM_BASICAUTH_HASH='$GM_BASICAUTH_HASH'
+export GRAFANA_ADMIN_PASSWORD='$GRAFANA_ADMIN_PASSWORD'
+export GRAFANA_ROOT_URL='$GRAFANA_ROOT_URL'
+export CADDY_SITE_ADDRESS='$CADDY_SITE_ADDRESS'
+export LOG_LEVEL='${LOG_LEVEL:-info}'
+export DICT_VERSION='$DICT_VERSION'
+export APP_VERSION='$APP_VERSION'
+export TELEGRAM_BOT_TOKEN='$TELEGRAM_BOT_TOKEN'
+export TELEGRAM_MINIAPP_URL='$TELEGRAM_MINIAPP_URL'
+export GATEWAY_VK_APP_SECRET='$GATEWAY_VK_APP_SECRET'
+export VITE_VK_APP_ID='$VITE_VK_APP_ID'
+export VITE_VK_ID_REDIRECT_URL='$VITE_VK_ID_REDIRECT_URL'
+export GATEWAY_VK_ID_CLIENT_SECRET='$GATEWAY_VK_ID_CLIENT_SECRET'
+export EXPORT_SIGN_KEY='$EXPORT_SIGN_KEY'
+export SMTP_RELAY_HOST='$SMTP_RELAY_HOST'
+export SMTP_RELAY_PORT='$SMTP_RELAY_PORT'
+export SMTP_RELAY_TLS='$SMTP_RELAY_TLS'
+export SMTP_RELAY_USER='$SMTP_RELAY_USER'
+export SMTP_RELAY_PASS='$SMTP_RELAY_PASS'
+export SMTP_RELAY_FROM='$SMTP_RELAY_FROM'
+export SMTP_RELAY_ADMIN_FROM='$SMTP_RELAY_ADMIN_FROM'
+export ADMIN_EMAIL='$ADMIN_EMAIL'
+export SMTP_RELAY_SERVICE_FROM='$SMTP_RELAY_SERVICE_FROM'
+export GRAFANA_SMTP_FROM_ADDRESS='$GRAFANA_SMTP_FROM_ADDRESS'
+export GRAFANA_SMTP_FROM_NAME='$GRAFANA_SMTP_FROM_NAME'
+export SERVICE_EMAIL='$SERVICE_EMAIL'
+export GRAFANA_SMTP_PORT='$GRAFANA_SMTP_PORT'
+export GF_SMTP_ENABLED='$GF_SMTP_ENABLED'
+export PUBLIC_BASE_URL='$PUBLIC_BASE_URL'
+export GATEWAY_ABUSE_BAN_ENABLED='true'
+EOF