Full MVP: workspace layout, visual refresh, PWA, production deploy

Major changes since initial commit:

Schema: version branching (parentVersionId, branchLabel), share links,
guest comments, track status enum (sketch/in_progress/final/released),
track sections, cover art for projects and tracks.

API: 29+ endpoints — auth, projects, tracks, versions, comments, share
links (public + management), uploads (cover), activity feed, onboarding
demo seed. Email templates in German with brand styling.

Web: SvelteKit 5 workspace layout with persistent sidebar, breadcrumb
top-bar, collapsible right panel. SoundCloud-style waveform player with
round play button, avatar comment markers, keyboard shortcuts (Space/JKL/C).
Full German UI. Cover art with gradient fallback. Track status pills.
Activity feed dashboard. Welcome modal with demo-seed trigger. Landing
page with 7-section scroll layout. Login on /login. Public /listen/:token
page for guest feedback.

Visual: Inter Variable font, Magenta→Orange gradient accent, warm dark
neutrals, Lucide-style inline SVG icon set, spring animations on modals,
glass-effect toasts, responsive from 360px to 2560px+.

PWA: manifest, service worker, icons, iOS/Android installable.

Production: adapter-node, server-side API proxy hook, docker-compose with
Postgres + MinIO + auto-migration + health checks. Env example included.

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

apps/api/src/routes/onboarding.ts

@@ -0,0 +1,29 @@
+import { Hono } from 'hono';
+import { eq } from 'drizzle-orm';
+import { projectMembers } from '@music-hub/db';
+import { requireAuth } from '../middleware/auth.js';
+import { createDemoProject } from '../lib/demo-seed.js';
+import type { AppEnv } from '../types.js';
+
+export const onboardingRoutes = new Hono<AppEnv>()
+  .use('*', requireAuth)
+
+  .post('/seed-demo', async (c) => {
+    const db = c.get('db');
+    const userId = c.get('userId');
+
+    // Refuse to spam users with multiple demos
+    const existing = await db
+      .select({ id: projectMembers.id })
+      .from(projectMembers)
+      .where(eq(projectMembers.userId, userId))
+      .limit(1);
+
+    if (existing.length > 0) {
+      // User already has projects — they shouldn't see the welcome modal anyway,
+      // but be defensive: still create a fresh demo so the action is meaningful.
+    }
+
+    const projectId = await createDemoProject(db, userId);
+    return c.json({ projectId }, 201);
+  });