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/api/src/modules/ai/tts.ts

@@ -0,0 +1,40 @@
+import { Hono } from "hono";
+
+import { Credits } from "@turbostarter/ai/credits/utils";
+import { getVoices, textToSpeech } from "@turbostarter/ai/tts/api";
+import { ttsSchema } from "@turbostarter/ai/tts/schema";
+
+import { deductCredits, enforceAuth, rateLimiter, validate } from "../../middleware";
+
+import type { User } from "@turbostarter/auth";
+
+export const ttsRouter = new Hono<{
+  Variables: {
+    user: User;
+  };
+}>()
+  .post(
+    "/",
+    enforceAuth,
+    rateLimiter,
+    validate("json", ttsSchema),
+    async (c) => {
+      const input = c.req.valid("json");
+
+      // Deduct credits
+      await deductCredits(Credits.COST.HIGH, "text-to-speech")(c, async () => { /* noop */ });
+
+      return new Response(
+        (await textToSpeech(input)) as unknown as ConstructorParameters<
+          typeof Response
+        >[0],
+        {
+          headers: { "Content-Type": "audio/mpeg" },
+        },
+      );
+    },
+  )
+  .get("/voices", enforceAuth, async (c) => {
+    const voices = await getVoices();
+    return c.json(voices);
+  });