✨ feat(lightwrite): add Beat/Lyrics Editor app

- Add NestJS backend with project, beat, marker, lyrics, export modules
- Add SvelteKit web app with wavesurfer.js waveform visualization
- Add BPM detection using Web Audio API peak detection
- Add marker timeline for parts, hooks, bridges
- Add lyrics editor with timestamp sync
- Add export to LRC, SRT, JSON formats
- Add shared-storage support for lightwrite
- Fix mana-core-auth env loading (add dotenv before validation)
- Add lightwrite to setup-databases.sh
- Fix matrix-onboarding-bot type errors (displayName → fullName)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/lightwrite/package.json

@@ -0,0 +1,7 @@
+{
+	"name": "lightwrite",
+	"private": true,
+	"scripts": {
+		"dev": "pnpm run --filter=@lightwrite/* --parallel dev"
+	}
+}