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/mobile/babel.config.js

@@ -0,0 +1,8 @@
+/** @type {import("@babel/core").ConfigFunction} */
+module.exports = (api) => {
+  api.cache(true);
+  return {
+    presets: [["babel-preset-expo", { unstable_transformImportMeta: true }]],
+    plugins: ["react-native-worklets/plugin"],
+  };
+};