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>

commitlint.config.ts

@@ -0,0 +1,11 @@
+import type { UserConfig } from "@commitlint/types";
+
+const Configuration: UserConfig = {
+  extends: ["@commitlint/config-conventional"],
+  rules: {
+    "body-max-length": [1, "always", 100],
+    "body-max-line-length": [1, "always", 100],
+  },
+};
+
+export default Configuration;