refactor: remove login page and auth system

feat: add multilingual UI (EN/HI/MR) with language toggle

refactor: code cleanup and App.jsx component split

fix(lint): resolve ESLint errors in App.jsx

feat(docs): implement high-fidelity document translation with style preservation

feat(ui): move offline capability and api cost stats to settings page

feat(ui): move Offline Node Status from dashboard to settings page

feat(ui): implement responsive mobile-first design with hamburger menu

refactor: update project branding and remove BAIF references

feat(ui): restyle frontend to match baif.org.in visual identity

Initial commit: BAIF Offline Translation Portal with production Dockerfile and recent optimizations