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/cms/src/utils/index.ts

@@ -0,0 +1,20 @@
+import { exec } from "child_process";
+import { promisify } from "util";
+
+const execPromise = promisify(exec);
+
+export const getLastModifiedAt = async (filePath: string) => {
+  try {
+    const { stdout } = await execPromise(
+      `git log -1 --format=%ai -- ${filePath}`,
+    );
+
+    if (stdout) {
+      return new Date(stdout.trim()).toISOString();
+    }
+
+    return new Date().toISOString();
+  } catch {
+    return new Date().toISOString();
+  }
+};