Initial commit: Music Hub collaboration platform

Full-stack music production collaboration tool with:
- SvelteKit frontend with Design System (CSS vars, 8 shared components)
- Hono API with auth, projects, tracks, versions, comments
- PostgreSQL + Drizzle ORM (8 tables, roles, permissions)
- S3-compatible storage with presigned upload URLs
- wavesurfer.js audio player with waveform visualization
- A/B version comparison with synchronized playback
- Timestamped comments with threading and resolve workflow
- Magic Link authentication with Resend email integration
- Background audio processing (ffmpeg transcode + waveform peaks)
- Role-based access control (Owner, Engineers, Artist, Label, Management, Viewer)
- Toast notifications, skeleton loading, responsive layout
- Docker deployment setup (API + Web + Postgres)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared/src/constants/audio.ts

@@ -0,0 +1,24 @@
+export const SUPPORTED_AUDIO_FORMATS = [
+  'audio/wav',
+  'audio/x-wav',
+  'audio/mp3',
+  'audio/mpeg',
+  'audio/flac',
+  'audio/x-flac',
+  'audio/aiff',
+  'audio/x-aiff',
+] as const;
+
+export const SUPPORTED_EXTENSIONS = ['.wav', '.mp3', '.flac', '.aiff', '.aif'] as const;
+
+export const MAX_FILE_SIZE = 500 * 1024 * 1024; // 500 MB
+
+export const VERSION_STATUSES = [
+  'uploaded',
+  'processing',
+  'ready',
+  'approved',
+  'rejected',
+] as const;
+
+export type VersionStatus = (typeof VERSION_STATUSES)[number];