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>

packages/db/drizzle.config.ts

@@ -0,0 +1,13 @@
+import { defineConfig } from "drizzle-kit";
+
+import { env } from "./src/env";
+
+export default defineConfig({
+  out: "./migrations",
+  schema: "./src/schema/index.ts",
+  dialect: "postgresql",
+  casing: "snake_case",
+  dbCredentials: {
+    url: env.DATABASE_URL,
+  },
+});