feat: Docker Compose setup for zero-dependency install

[baramgay]

Closes #3

What's included

• Dockerfile — python:3.11-slim, installs only core deps (fastapi, uvicorn, pydantic, openai, python-dotenv). Skips win10toast (Windows-only) and heavy optional deps (chromadb, sentence-transformers).
• docker-compose.yml — single api service on port 8000, volume mounts for agents/, wiki/, and data files, AGENTS_HOME=/app wired in, optional .env passthrough.
• README.md — Docker Quick Start section added at the top of the installation guide.

Usage

git clone https://github.com/baramgay/agentops.git
cd agentops
cp .env.example .env   # optional: fill in OPENAI_API_KEY for LLM features
docker compose up
# Dashboard → http://localhost:8000

Design notes

• Single container: api_server.py already serves both API and static assets, so no nginx sidecar needed.
• Volume mounts: agents/, wiki/, issues.json, agent_status.json, projects.json — host edits reflect instantly inside the container; state survives restarts.
• Lean image: heavy optional deps excluded to keep the image small. Users who need chromadb can extend the Dockerfile or add a sidecar service.

Acceptance criteria

• docker-compose.yml at repo root
• Dockerfile for the API server
• Volume mounts for agents/, wiki/, issues.json
• AGENTS_HOME environment variable passthrough
• README Quick Start updated