* docs: add comprehensive dashboard migration documentation
- Add detailed schema version migration guide with step-by-step instructions
- Reorganize main migration README to focus on conversion-level practices
- Add monitoring section with metrics, logging, and error handling
- Include comprehensive testing strategies for backend and frontend
- Provide clear separation between conversion practices and implementation details
* chore: update .gitignore
* Update .gitignore
Jean-Philippe Quéméner
Ivan Ortega Alba