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/email/src/server.ts

@@ -0,0 +1,38 @@
+import { logger } from "@turbostarter/shared/logger";
+
+import { send } from "./providers";
+import { getTemplate } from "./templates";
+
+import type { EmailTemplate, EmailVariables } from "./types";
+
+const sendEmail = async <T extends EmailTemplate>({
+  to,
+  template,
+  locale,
+  variables,
+}: {
+  to: string;
+  template: T;
+  variables: EmailVariables[T];
+  locale?: string;
+}) => {
+  logger.info(`Sending email ${template} to ${to}`);
+
+  try {
+    const { html, text, subject } = await getTemplate({
+      id: template,
+      variables,
+      locale,
+    });
+
+    const result = await send({ to, subject, html, text });
+    logger.info(`Email sent successfully to ${to}`);
+
+    return result;
+  } catch (error) {
+    logger.error(error, `Failed to send email ${template} to ${to}`);
+    throw error;
+  }
+};
+
+export { sendEmail };