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>

.context/turbostarter-framework-context/sections/mobile/database.md

@@ -0,0 +1,39 @@
+---
+title: Database
+description: Get started with the database.
+url: /docs/mobile/database
+---
+
+# Database
+
+<Callout type="error" title="API deployment required">
+  To enable communication between your Expo app and the server in a production environment, the web application with Hono API must be deployed first.
+
+  <Cards>
+    <Card title="API" description="Learn more about the API." href="/docs/web/api/overview" />
+
+    <Card title="Web deployment" description="Deploy your web application to production." href="/docs/web/deployment/checklist" />
+  </Cards>
+</Callout>
+
+As a mobile app uses only client-side code, **there's no way to interact with the database directly**.
+
+Also, you should avoid any workarounds to interact with the database directly, because it can lead to leaking your database credentials and other security issues.
+
+## Recommended approach
+
+You can safely use the [API](/docs/mobile/api/overview) and call the endpoints which will run queries on the database.
+
+To do this you need to set up the database on the [web, server side](/docs/web/database/overview) and then use the [API client](/docs/mobile/api/client) to interact with it.
+
+Learn more about its configuration in the web part of the docs, especially in the following sections:
+
+<Cards>
+  <Card title="Overview" description="Get started with the database" href="/docs/web/database/overview" />
+
+  <Card title="Schema" description="Learn about the database schema." href="/docs/web/database/schema" />
+
+  <Card title="Migrations" description="Migrate your changes to the database." href="/docs/web/database/migrations" />
+
+  <Card title="Database client" description="Use database client to interact with the database." href="/docs/web/database/client" />
+</Cards>