Fix PTY: use pty.fork() via thread executor

Revert: remove os.setsid that hangs the server

Fix PTY: add os.setsid preexec for proper job control

Revert PTY backend to simplest working version

Fix input: rewrite PTY backend + force focus on terminal/editor

Fix terminal: focus + WS reconnection after refresh

Fix crash: replace os.fork() with subprocess.Popen for PTY

Add full TUI/PTY terminal support with xterm.js

Fix register 500: use explicit column names in INSERT to match 5-column users table

Add Connected Apps UI and GitHub OAuth integration

Fix JS syntax and restore HF data on startup

Use Hugging Face API for sync

Fix HF CLI missing error and GitHub clone hang

feat: complete data syncing, import/export, file manager, and chat history

fix: resolve 422 unprocessable entity on publish route

feat: revamp publishing modal with file selection and expand AI models

feat: complete project publishing, ai chat, and mobile terminal enhancements

feat: enhance mobile terminal, live preview imports, and theme settings

Update backend/main.py

Create backend/routes_terminal.py

Create backend/routes_ai.py

Create backend/routes_files.py

Create backend/routes_auth.py

Create backend/main.py

Create backend/database.py

Create backend/__init__.py