Refactor API boundaries and desloppify cleanup across backend and dashboard flows

[Feikovandijk]

Summary

• align backend and frontend API surfaces to reduce duplicated clients, payload shapes, and boundary inconsistencies
• clean up auth and middleware noise by removing debug-heavy logging and trimming repetitive infrastructure docblocks
• update dashboard and trends components to use shared types and valid chart configuration so the frontend builds cleanly
• add project hygiene updates for desloppify workflow artifacts and document progress/output files
• include follow-up backend script, controller, utility, and test updates tied to the code-health pass

Testing

• cd api && npm test
• cd api && npm run type-check
• cd devdashboard && npm test
• cd devdashboard && npm run type-check
• cd devdashboard && npm run build
• cd user-dashboard && npm test
• cd user-dashboard && npm run type-check
• cd user-dashboard && npm run build

[gemini-code-assist]

Code Review

This pull request introduces the 'desloppify' tool documentation and progress tracking while implementing extensive code cleanup and type safety enhancements. Key improvements include replacing 'any' types with specific interfaces, removing verbose debug logs, and adding unit tests for configuration, middleware, and utility functions. Review feedback focuses on maintaining appropriate logging levels for critical errors, removing redundant empty middleware in the authentication flow, and refining type guards to ensure proper object narrowing in the dashboard statistics logic.