docs: Adopt Spec-Driven Development framework
Establish complete Spec-Driven Development documentation structure to
enable AI-assisted implementation with product context, feature specs,
and architectural standards.
Documentation:
- Add product docs (product.md, roadmap.md) for business context
- Add feature specs for marketdata, news, and socialmedia domains
- Add technical standards (practices.md, security.md, style.md, tech.md)
- Update README with SDD workflow and PostgreSQL architecture
Restructure:
- Move Docker files to docker/db/ for cleaner organization
- Move docker-compose.yml to project root
- Remove deprecated configs (litellm.yml, package.json, setup.py)
- Update tests for pytest-vcr integration
This establishes the foundation for /spec:* workflow commands and
structured AI-agent collaboration.
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