Sync deploy: backend, frontend, worker, docker, config

docker/docker-compose.coolify-merged.yml

@@ -369,6 +369,8 @@ services:
     environment:
       PORT: "3000"
       HOSTNAME: 0.0.0.0
+      # Required: persistent key so Server Action IDs stay valid across deploys (avoids "Failed to find Server Action" + 504)
+      NEXT_SERVER_ACTIONS_ENCRYPTION_KEY: ${NEXT_SERVER_ACTIONS_ENCRYPTION_KEY:-}
     networks:
       - frontend
     ports:

env.staging.example

@@ -71,6 +71,10 @@ FRONTEND_PORT=3000
 NEXT_PUBLIC_API_BASE_URL=https://app.getlinkzen.com
 NEXT_PUBLIC_API_URL=https://app.getlinkzen.com
 NEXT_PUBLIC_KEYCLOAK_URL=https://auth.getlinkzen.com
+# Next.js Server Actions: persistent encryption key (base64). REQUIRED for production/staging to avoid
+# "Failed to find Server Action" and 504 after redeploys. Generate once, keep the same forever (all deploys):
+#   node -e "console.log(require('crypto').randomBytes(32).toString('base64'))"
+NEXT_SERVER_ACTIONS_ENCRYPTION_KEY=
 
 # Tier 2 (022) – fallback only; DB is source of truth. See docs/runtime-configuration-implementation.md §1.4
 FEATURE_ADS_ENABLED=false