feat: turbostarter boilerplate

Production-ready Next.js boilerplate with:
- Runtime env validation (fail-fast on missing vars)
- Feature-gated config (S3, Stripe, email, OAuth)
- Docker + Coolify deployment pipeline
- PostgreSQL + pgvector, MinIO S3, Better Auth
- TypeScript strict mode (no ignoreBuildErrors)
- i18n (en/es), AI modules, billing, monitoring

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/instrumentation.ts

@@ -0,0 +1,9 @@
+import { initialize } from "@turbostarter/monitoring-web/server";
+import { validateRuntimeEnv } from "@turbostarter/shared/validate-env";
+
+export function register() {
+  validateRuntimeEnv();
+  initialize();
+}
+
+export { onRequestError } from "@turbostarter/monitoring-web/server";