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/track.ts

@@ -0,0 +1,32 @@
+import { z } from 'zod';
+import { SUPPORTED_AUDIO_FORMATS, MAX_FILE_SIZE } from '../constants/audio.js';
+
+export const createTrackSchema = z.object({
+  name: z.string().min(1).max(255),
+  description: z.string().max(2000).optional(),
+});
+
+export const updateTrackSchema = z.object({
+  name: z.string().min(1).max(255).optional(),
+  description: z.string().max(2000).optional(),
+});
+
+export const requestUploadUrlSchema = z.object({
+  fileName: z.string().min(1),
+  mimeType: z.enum(SUPPORTED_AUDIO_FORMATS),
+  fileSize: z.number().int().positive().max(MAX_FILE_SIZE),
+});
+
+export const createVersionSchema = z.object({
+  fileKey: z.string().min(1),
+  label: z.string().max(100).optional(),
+  notes: z.string().max(2000).optional(),
+  originalFileName: z.string().min(1),
+  mimeType: z.string().min(1),
+  fileSize: z.number().int().positive(),
+});
+
+export type CreateTrackInput = z.infer<typeof createTrackSchema>;
+export type UpdateTrackInput = z.infer<typeof updateTrackSchema>;
+export type RequestUploadUrlInput = z.infer<typeof requestUploadUrlSchema>;
+export type CreateVersionInput = z.infer<typeof createVersionSchema>;