feat/fix: Rich token usage popovers, robust LiteLLM context window bounds logic, and Skill management refactor

chore: remove hardcoded prod passwords from test scripts and workflows

Cleanup skill logic files and update deployment scripts

refactor: re-org frontend folder structure to simply be 'frontend' ...

- Moved ui/client-app to frontend/

- Updated README and documentation references

- Updated docker-compose, local run scripts, and remote deploy scripts to point to new frontend location

feat(ui): move logout button from sidebar to profile page