feat: add Docker support and improve /health endpoint

- Add Dockerfile (node:20-alpine, EXPOSE 3456, ENV for session tokens)
- Add docker-compose.yml with restart: unless-stopped
- Add .dockerignore
- Improve /health: add version, uptime, uptimeHuman, per-pool ready/error status
- Listen on 0.0.0.0 for container compatibility
- Bump version to 1.4.0

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

README.md

@@ -28,6 +28,25 @@ The proxy translates OpenAI-compatible `/v1/chat/completions` requests into `cla
 
 ## Quick Install
 
+### Docker (recommended)
+
+```bash
+git clone https://github.com/dtzp555-max/openclaw-claude-proxy.git
+cd openclaw-claude-proxy
+cp .env.example .env   # add your CLAUDE_SESSION_TOKEN / CLAUDE_COOKIES
+docker compose up -d
+```
+
+Or as a single command if you already have a `.env` ready:
+
+```bash
+git clone https://github.com/dtzp555-max/openclaw-claude-proxy.git && cd openclaw-claude-proxy && docker compose up -d
+```
+
+Health check: `curl http://localhost:3456/health`
+
+### Node.js (local)
+
 ```bash
 # Clone
 git clone https://github.com/dtzp555-max/openclaw-claude-proxy.git