feat: add Vue 3 frontend and refine Angular/React UIs}
- Add complete Vue 3 + Pinia frontend with Vite build configuration including all pages, dialogs, stores, components, and themes - Add file type detection utility (src/core/detect-file-type.ts) - Add icon registry service for Angular Material SVG icons - Refine Angular dialog and component templates with UI improvements - Update React components with dialog, layout, and theme refinements - Improve console, database key, monitoring, and settings page layouts - Update index.html entry points for all three frameworks - Update build configs (angular.json, tsconfig, Gruntfile.js) - Add Vue-related dependencies and update yarn.lock - Remove obsolete artifacts/reduce-bundle-size.txt - Update README with Vue frontend documentation