feat(transcriber): Add YouTube transcriber app to monorepo

Integrate new transcriber application for AI-powered YouTube video
transcription with full monorepo structure and Groq Whisper API support.

## App Structure
- apps/transcriber/apps/backend - NestJS API server (port 3006)
- apps/transcriber/apps/web - SvelteKit web application
- apps/transcriber/apps/landing - Astro marketing/content site
- apps/transcriber/apps/mobile - Expo React Native app
- apps/transcriber/packages/shared-types - Shared TypeScript types

## Backend Features
- YouTube video download via yt-dlp (child_process)
- Ultra-fast transcription via Groq Whisper API (~300x realtime)
- Fallback to local Whisper for offline use
- Job queue with background processing
- Real-time progress updates via WebSocket (Socket.io)
- Playlist management for batch processing
- Health check endpoints

## API Endpoints
- POST /transcription - Start transcription job
- GET /transcription - List all jobs
- GET /transcription/:id - Get job status
- DELETE /transcription/:id - Cancel job
- GET /transcription/stats - Statistics
- GET /whisper/models - Available models
- GET/POST/DELETE /playlist - Playlist management
- GET /health - Health checks

## Whisper Models
- Groq: whisper-large-v3-turbo (fast, $0.04/hr)
- Groq: whisper-large-v3 (accurate, $0.111/hr)
- Local: tiny, base, small, medium, large

## Monorepo Integration
- Added to pnpm workspace via apps/*/apps/* pattern
- Root scripts: transcriber:dev, dev:transcriber:*
- Package naming: @transcriber/{backend,web,landing,mobile}
- Turbo tasks: dev, build, lint, type-check
- CLAUDE.md documentation

## Technology Stack
- Backend: NestJS 10, TypeScript, Socket.io
- Web: SvelteKit 2, Svelte 5, Tailwind CSS
- Landing: Astro 4, Solid.js, Tailwind CSS
- Mobile: Expo 52, React Native, NativeWind, Zustand
- Transcription: Groq Whisper API (OpenAI-compatible)

## Migration from Python
- Original Python/FastAPI code preserved in legacy/
- Full rewrite to TypeScript/NestJS
- Same functionality with improved architecture

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -2,7 +2,7 @@
   "name": "manacore-monorepo",
   "version": "1.0.0",
   "private": true,
-  "description": "Manacore Monorepo containing maerchenzauber, manacore, manadeck, memoro, picture, uload, chat, nutriphi, and news",
+  "description": "Manacore Monorepo containing maerchenzauber, manacore, manadeck, memoro, picture, uload, chat, nutriphi, news, and transcriber",
   "scripts": {
     "dev": "turbo run dev",
     "build": "turbo run build",
@@ -73,6 +73,13 @@
     "news:db:push": "pnpm --filter @manacore/news-database db:push",
     "news:db:studio": "pnpm --filter @manacore/news-database db:studio",
 
+    "transcriber:dev": "turbo run dev --filter=transcriber...",
+    "dev:transcriber:mobile": "pnpm --filter @transcriber/mobile dev",
+    "dev:transcriber:web": "pnpm --filter @transcriber/web dev",
+    "dev:transcriber:landing": "pnpm --filter @transcriber/landing dev",
+    "dev:transcriber:backend": "pnpm --filter @transcriber/backend dev",
+    "dev:transcriber:app": "turbo run dev --filter=@transcriber/web --filter=@transcriber/backend",
+
     "docker:up": "docker compose -f docker-compose.dev.yml --env-file .env.development up -d postgres redis",
     "docker:up:auth": "docker compose -f docker-compose.dev.yml --env-file .env.development --profile auth up -d",
     "docker:up:chat": "docker compose -f docker-compose.dev.yml --env-file .env.development --profile chat up -d",