refactor: code cleanup and App.jsx component split

feat: optimize for HF Spaces deployment

fix: modernize startup with lifespan and add explicit health checks

fix: add health check and improved logging for HF Spaces

fix: pin bcrypt for passlib compatibility and fix backend imports

fix: resolve ModuleNotFoundError and simplify CI/CD

fix(ci): use backend. prefix in fallback imports and guard module-level init_db()

fix(ci): install backend/requirements.txt in CI workflow

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

fix: resolve relative import in app.py for test discovery

fix(backend): resolve type safety issues with file.filename in app.py

style(ui): refine mobile navbar with full-screen toggle and improved spacing

refactor: update project branding and remove BAIF references

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