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>

.context/turbostarter-framework-context/sections/ai/docs/tts.md

@@ -0,0 +1,89 @@
+---
+title: Text to Speech
+description: Convert text into natural-sounding speech using advanced AI voice synthesis models.
+url: /ai/docs/tts
+---
+
+# Text to Speech
+
+The [Text to Speech (TTS)](https://ai.turbostarter.dev/tts) demo application transforms written text into high-quality spoken audio. It leverages state-of-the-art AI models to generate lifelike voices in various languages and styles.
+
+<AIAppShowcase id="tts" />
+
+## Features
+
+Discover the powerful capabilities of this AI-powered voice synthesis solution:
+
+<Cards>
+  <Card title="5,000+ voices">
+    Access a wide range of voices from providers like [Eleven
+    Labs](https://elevenlabs.io/), including different accents, ages, and
+    emotional tones, to find the perfect match for your content.
+  </Card>
+
+  <Card title="Real-time audio streaming">
+    Experience near-instantaneous audio generation with streaming delivery,
+    providing immediate feedback as your content comes to life.
+  </Card>
+
+  <Card title="Integrated audio player">
+    Enjoy a full-featured playback interface with precise controls for playback
+    speed and convenient options to download generated audio files.
+  </Card>
+
+  <Card title="Voice customization">
+    Fine-tune your audio output with adjustable parameters for pitch, speed, and
+    pauses, creating the most natural and engaging delivery possible (available
+    options vary by provider).
+  </Card>
+
+  <Card title="Intuitive user experience">
+    Benefit from a thoughtfully designed interface that makes transforming text
+    to speech effortless and efficient, even for first-time users.
+  </Card>
+</Cards>
+
+## AI models
+
+This application primarily utilizes specialized text-to-speech models from [Eleven Labs](https://elevenlabs.io/).
+
+<Cards>
+  <Card href="/ai/docs/eleven-labs" title="Eleven Labs" description="Integrate Eleven Labs' state-of-the-art voice synthesis technology for stunningly realistic and expressive speech generation." icon={<ElevenLabs />} />
+</Cards>
+
+For comprehensive information about available voices and advanced customization techniques, consult the [ElevenLabs SDK documentation](https://elevenlabs.io/docs/overview).
+
+## Structure
+
+The Text-to-Speech feature is organized across the monorepo for maximum flexibility and maintainability:
+
+### Core
+
+The `@turbostarter/ai` package (`packages/ai`) contains the essential logic under `modules/tts`:
+
+* Comprehensive types, validation schemas, and constants specific to TTS functionality
+* Core API logic for processing text-to-speech requests and interfacing with AI models
+* Robust handling of generated audio file uploads to cloud storage
+
+### API
+
+The `packages/api` package defines the backend API endpoints using [Hono](https://hono.dev/):
+
+* `src/modules/ai/tts/tts.router.ts`: implements Hono RPC routes for TTS generation, handles input validation, applies critical middleware (authentication, credit management), and invokes the core functionality from `@turbostarter/ai`.
+
+### Web
+
+The [Next.js](https://nextjs.org/) application (`apps/web`) provides the user interface:
+
+* `src/app/[locale]/(apps)/tts/**`: contains the Next.js App Router pages and layouts for the TTS experience
+* `src/components/tts/**`: houses reusable React components specific to the TTS interface (text input area, voice selector, audio player, etc.)
+
+### Mobile
+
+The [Expo](https://expo.dev/)/[React Native](https://reactnative.dev/) application (`apps/mobile`) provides the native mobile experience:
+
+* `src/app/tts/**`: defines the screens for the mobile TTS interface
+* `src/components/tts/**`: contains React Native components optimized for the mobile experience
+* **API interaction**: utilizes the same Hono RPC client (`packages/api`) as the web app for consistent communication with the backend
+
+This architecture ensures perfect consistency between platforms while allowing for optimized UI implementations tailored to each environment.