feat: Next.js + Socket.IO 3-mode game (Skribbl, Gartic, Color)

README.md

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+# DrawTogether
+
+Three-mode web game built with **Next.js 14 (App Router) + Socket.IO**:
+
+- **Skribbl Race** — one player draws, others guess.
+- **Gartic Phone** — pass-it-on prompt → drawing → guess loop.
+- **Color Together** — shared coloring book with templates and free draw.
+
+## Stack
+- Next.js 14, React 18, TypeScript
+- Tailwind CSS
+- Custom Node server (`server.js`) hosting Next + Socket.IO on a single port
+- OpenTelemetry auto-instrumentation (traces) → SigNoz OTLP HTTP
+
+## Run locally
+```bash
+npm install
+npm run build
+npm start              # serves on :3000
+```
+
+Dev mode: `npm run dev` (also via `server.js`).
+
+## Environment
+| var | default | what |
+| --- | --- | --- |
+| `PORT` | `3000` | http port |
+| `SIGNOZ_OTEL_ENDPOINT` | `http://100.64.0.10:4318` | OTLP base for tracing |
+| `NODE_ENV` | `production` in container | |
+
+## Endpoints
+- `GET /` — landing
+- `GET /create` — create-room form
+- `GET /join` — join form
+- `GET /room/[code]` — lobby (auto-redirects to `/play` when host starts)
+- `GET /room/[code]/play` — game UI (skribbl/gartic/color)
+- `GET /room/[code]/results` — final scores / Gartic books
+- `GET /api/health` — health check
+- `GET /api/room/[code]/exists` — quick room lookup
+- WebSocket on the same port at `/socket.io`
+
+## Docker
+```bash
+docker build -t drawtogether .
+docker run -p 3000:3000 drawtogether
+```