feat: initial scaffold for ClickTrack monorepo

Full self-hosted click track generator for cover bands.

Core technical pieces implemented:
- CTP (Click Track Protocol) TypeScript schema, Zod validator, and WAV
  renderer (44.1 kHz, 16-bit PCM, accented downbeats, ramp sections)
- MusicBrainz API client with 1 req/s rate limiting
- PostgreSQL schema (songs, tempo_maps, registry_sync_log) with triggers
- Git registry sync logic (clone/pull → validate CTP → upsert DB)
- Next.js 14 App Router: search page, track page, API routes
  (/api/songs, /api/tracks, /api/generate)
- UI components: SearchBar, SongResult, TempoMapEditor, ClickTrackPlayer
  (Web Audio API in-browser playback + WAV download)
- Docker Compose stack: app + postgres + redis + nginx + registry-sync
- Multi-stage Dockerfile with standalone Next.js output
- .env.example documenting all configuration variables
- README with setup instructions, CTP format spec, and API reference

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -0,0 +1,34 @@
+{
+  "name": "clicktrack",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint",
+    "typecheck": "tsc --noEmit",
+    "db:migrate": "psql $DATABASE_URL -f lib/db/schema.sql"
+  },
+  "dependencies": {
+    "next": "14.2.3",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "zod": "^3.23.8",
+    "pg": "^8.11.5",
+    "ioredis": "^5.3.2",
+    "node-fetch": "^3.3.2"
+  },
+  "devDependencies": {
+    "@types/node": "^20.12.7",
+    "@types/react": "^18.3.1",
+    "@types/react-dom": "^18.3.0",
+    "@types/pg": "^8.11.5",
+    "typescript": "^5.4.5",
+    "tailwindcss": "^3.4.3",
+    "autoprefixer": "^10.4.19",
+    "postcss": "^8.4.38",
+    "eslint": "^8.57.0",
+    "eslint-config-next": "14.2.3"
+  }
+}