feat: add docker-compose.yml for simple local deployment

[ChefControl]

Context

The KISS principle says to keep things simple. Currently, the project requires Kubernetes + Helm to run, which is a high barrier for individual Red & Blue team members who want to try the tool quickly.

Proposed Solution

• Create a docker-compose.yml at the repo root with:
  • Neo4j (with appropriate config)
  • Manager service
  • Feeder service (with configurable replica count)
  • Frontend (or served via manager)
• Document a 3-step quick start in the README

Acceptance Criteria

• docker-compose up starts a working instance
• README documents the quick-start flow
• All services connect and communicate correctly
• Works on Linux and macOS

[ChefControl]

A workspace is ready for this issue.

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