Запрос на слияние 'docs/eduflow-scope-expansion' (#1) из docs/eduflow-scope-expansion в main

docs: stabilize EduFlow product foundation

docs: integrate product roadmap

docs: integrate domain glossary safely

docs: integrate stakeholder model

docs: stabilize EduFlow product foundation

docs: integrate product roadmap

docs: integrate domain glossary safely

docs: integrate stakeholder model

docs: add TutorHelp product roadmap

docs: add TutorHelp domain glossary

docs: add stakeholders and user roles

chore: initialize TutorHelp repository

update: about.md

update: about.md

update: about.md

update: database-overview.md, sql-techniques.md