feat(gateway): wire GATEWAY_HONEYTOKEN through the deploy

The planted honeytoken bearer trap already existed in the gateway + compose, but
no workflow fed GATEWAY_HONEYTOKEN, so it was always empty (inert). Wire the
per-contour TEST_/PROD_GATEWAY_HONEYTOKEN secret into the ci deploy, prod-deploy
and prod-rollback env (the prod path via the shared deploy/write-prod-env.sh),
document it (deploy/README + .env.example), and fix the stale compose comment.

Empty secret = trap off (no ":?" guard), so a deploy is safe before the operator
sets the value + plants the bait. On prod (IP ban on) presenting it earns a 24h
ban + alarm; on test (ban off) it logs + a ban metric.

GF_SMTP_ENABLED is enabled separately via the TEST_/PROD_GF_SMTP_ENABLED Gitea
variables (=true) — no code change.

.gitea/workflows/ci.yaml

@@ -335,6 +335,9 @@ jobs:
           # for the server-side confidential code exchange — a SEPARATE VK app from the Mini
           # App above. One VK ID "Web" app serves every contour -> unprefixed secret.
           GATEWAY_VK_ID_CLIENT_SECRET: ${{ secrets.GATEWAY_VK_ID_CLIENT_SECRET }}
+          # Planted honeytoken bearer: presenting it flags the caller (logs + a ban metric on
+          # test where the IP ban is off; a 24h IP ban on prod). Per-contour secret; empty = trap off.
+          GATEWAY_HONEYTOKEN: ${{ secrets.TEST_GATEWAY_HONEYTOKEN }}
           # Signs the finished-game export download URLs (backend + compose interpolation).
           EXPORT_SIGN_KEY: ${{ secrets.TEST_EXPORT_SIGN_KEY }}
           # Transactional email via the shared Selectel relay: one account for every

.gitea/workflows/prod-deploy.yaml

@@ -98,6 +98,9 @@ jobs:
       # derived from PUBLIC_BASE_URL in deploy/write-prod-env.sh.
       VITE_VK_APP_ID: ${{ vars.VITE_VK_APP_ID }}
       GATEWAY_VK_ID_CLIENT_SECRET: ${{ secrets.GATEWAY_VK_ID_CLIENT_SECRET }}
+      # Planted honeytoken bearer: presenting it earns a 24h IP ban + a high-severity alarm.
+      # Per-contour secret; empty = trap off. Rendered by deploy/write-prod-env.sh.
+      GATEWAY_HONEYTOKEN: ${{ secrets.PROD_GATEWAY_HONEYTOKEN }}
       # Signs the finished-game export download URLs (backend BACKEND_EXPORT_SIGN_KEY).
       EXPORT_SIGN_KEY: ${{ secrets.PROD_EXPORT_SIGN_KEY }}
       # Transactional email via the shared Selectel relay (confirm-codes): one account for

.gitea/workflows/prod-rollback.yaml

@@ -63,6 +63,7 @@ jobs:
       GATEWAY_VK_APP_SECRET: ${{ secrets.GATEWAY_VK_APP_SECRET }}
       VITE_VK_APP_ID: ${{ vars.VITE_VK_APP_ID }}
       GATEWAY_VK_ID_CLIENT_SECRET: ${{ secrets.GATEWAY_VK_ID_CLIENT_SECRET }}
+      GATEWAY_HONEYTOKEN: ${{ secrets.PROD_GATEWAY_HONEYTOKEN }}
       EXPORT_SIGN_KEY: ${{ secrets.PROD_EXPORT_SIGN_KEY }}
       SMTP_RELAY_USER: ${{ secrets.SMTP_RELAY_USER }}
       SMTP_RELAY_PASS: ${{ secrets.SMTP_RELAY_PASS }}