refactor: Clean up project structure and organize files
- Add __DELETE_LATER to .gitignore (preserving for later review)
- Move coordination-plans to docs/ for better organization
- Move deployment files to docs/deployment/
- Move migration and schema files to docs/migration/
- Move lib/schemas to src/api (proper location)
- Remove empty/unused folders (services, extension, config, logs)
- Remove unused config files (jest, lefthook, playwright, settings)
- Consolidate documentation in docs/ folder