refactor: restructure to monorepo with npm workspaces (Phase 0)

Move frontend to packages/client/, server to packages/server/.
Root package.json uses npm workspaces to orchestrate both.

Structure:
  reaktor/
    packages/client/  (React + Vite + Tone.js frontend)
    packages/server/  (static file server, future API)
    dist/             (built output, shared)
    docker-compose.yml (app + PostgreSQL for future backend)

- npm run dev → runs Vite dev server from client workspace
- npm run build → builds client, outputs to root dist/
- npm run start → runs server.js serving dist/
- Dockerfile updated for multi-stage monorepo build
- docker-compose.yml added with PostgreSQL service (ready for Phase 1)
- All imports and paths preserved, zero functionality change

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

Dockerfile

@@ -1,13 +1,17 @@
 FROM node:20-alpine AS build
 WORKDIR /app
 COPY package.json package-lock.json* ./
+COPY packages/client/package.json packages/client/
+COPY packages/server/package.json packages/server/
 RUN npm install
-COPY . .
+COPY packages/client packages/client
 RUN npm run build
 
 FROM node:20-alpine
 WORKDIR /app
 COPY --from=build /app/dist ./dist
-COPY server.js .
+COPY packages/server/server.js ./packages/server/server.js
+COPY packages/server/package.json ./packages/server/package.json
+COPY package.json ./
 EXPOSE 80
-CMD ["node", "server.js"]
+CMD ["node", "packages/server/server.js"]

docker-compose.yml

@@ -0,0 +1,24 @@
+services:
+  app:
+    build: .
+    ports:
+      - "80:80"
+    depends_on:
+      db:
+        condition: service_healthy
+
+  db:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: reaktor
+      POSTGRES_PASSWORD: reaktor_dev
+      POSTGRES_DB: reaktor
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U reaktor"]
+      interval: 5s
+      retries: 5
+
+volumes:
+  pgdata:

package-lock.json

@@ -1,21 +1,14 @@
 {
-  "name": "reaktor-montlab",
+  "name": "reaktor",
   "version": "1.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "reaktor-montlab",
-      "version": "1.0.0",
-      "dependencies": {
-        "react": "^18.2.0",
-        "react-dom": "^18.2.0",
-        "tone": "^14.8.49"
-      },
-      "devDependencies": {
-        "@vitejs/plugin-react": "^4.2.0",
-        "vite": "^5.4.0"
-      }
+      "name": "reaktor",
+      "workspaces": [
+        "packages/*"
+      ]
     },
     "node_modules/@babel/code-frame": {
       "version": "7.29.0",
@@ -749,6 +742,14 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@reaktor/client": {
+      "resolved": "packages/client",
+      "link": true
+    },
+    "node_modules/@reaktor/server": {
+      "resolved": "packages/server",
+      "link": true
+    },
     "node_modules/@rolldown/pluginutils": {
       "version": "1.0.0-beta.27",
       "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-beta.27.tgz",
@@ -1722,6 +1723,23 @@
       "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
       "dev": true,
       "license": "ISC"
+    },
+    "packages/client": {
+      "name": "@reaktor/client",
+      "version": "1.0.0",
+      "dependencies": {
+        "react": "^18.2.0",
+        "react-dom": "^18.2.0",
+        "tone": "^14.8.49"
+      },
+      "devDependencies": {
+        "@vitejs/plugin-react": "^4.2.0",
+        "vite": "^5.4.0"
+      }
+    },
+    "packages/server": {
+      "name": "@reaktor/server",
+      "version": "1.0.0"
     }
   }
 }

package.json

@@ -1,21 +1,10 @@
 {
-  "name": "reaktor-montlab",
-  "version": "1.0.0",
+  "name": "reaktor",
   "private": true,
-  "type": "module",
+  "workspaces": ["packages/*"],
   "scripts": {
-    "dev": "vite",
-    "build": "vite build",
-    "preview": "vite preview",
-    "start": "node server.js"
-  },
-  "dependencies": {
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
-    "tone": "^14.8.49"
-  },
-  "devDependencies": {
-    "@vitejs/plugin-react": "^4.2.0",
-    "vite": "^5.4.0"
+    "dev": "npm run dev -w packages/client",
+    "build": "npm run build -w packages/client",
+    "start": "node packages/server/server.js"
   }
 }

packages/client/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "@reaktor/client",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "tone": "^14.8.49"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-react": "^4.2.0",
+    "vite": "^5.4.0"
+  }
+}

packages/client/vite.config.js

@@ -4,5 +4,5 @@ import react from '@vitejs/plugin-react';
 export default defineConfig({
   plugins: [react()],
   server: { port: 3000 },
-  build: { outDir: 'dist' }
+  build: { outDir: '../../dist', emptyOutDir: true }
 });

packages/server/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "@reaktor/server",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "start": "node server.js"
+  }
+}

packages/server/server.js

@@ -4,7 +4,7 @@ const fs = require('fs');
 const path = require('path');
 
 const PORT = process.env.PORT || 80;
-const STATIC_DIR = path.join(__dirname, 'dist');
+const STATIC_DIR = path.join(__dirname, '..', '..', 'dist');
 
 const MIME = {
   '.html': 'text/html', '.css': 'text/css', '.js': 'application/javascript',