next-env.d.ts is a generated file using triple-slash references that
TypeScript requires. ESLint exemption added in apps/web-next config only.
Also declare CI, DATABASE_URL, PAYLOAD_SECRET, NODE_ENV in turbo.json
globalEnv so turbo/no-undeclared-env-vars stops warning.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>