Validates all required env vars at runtime with zod schemas.
Skips validation during build via SKIP_ENV_VALIDATION flag.
Replaces scattered process.env access with typed env imports.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Turbo was stripping env vars during build on Vercel. Added all required
vars to turbo.json build task. Also hardened Supabase and BetterAuth
init with fallback placeholders for build-time safety.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Defer database client creation until first use via Proxy so Next.js
builds succeed without POSTGRES_URL and SUPABASE_URL env vars present.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
