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/validation/auth.ts

@@ -0,0 +1,12 @@
+import { z } from 'zod';
+
+export const magicLinkSchema = z.object({
+  email: z.string().email(),
+});
+
+export const verifyTokenSchema = z.object({
+  token: z.string().min(1),
+});
+
+export type MagicLinkInput = z.infer<typeof magicLinkSchema>;
+export type VerifyTokenInput = z.infer<typeof verifyTokenSchema>;