chore: update anthropic model name to claude-sonnet-4-5-20250929

feat: enhance frontend with routing and conversation sharing; add Home and Chat pages, integrate ShareButton component, and update API interactions

feat: containerize

chore: add .dockerignore file to exclude unnecessary files from Docker context

feat: add Dockerfile and .dockerignore for backend setup; configure development and production stages

feat: integrate Pending Approvals component into App; add styles and API service for managing tool approvals

feat: add endpoint to retrieve pending tool approvals for conversations; implement corresponding service and workflow query

feat: enhance conversation handling and logging in App component; improve message parsing in ChatWindow

feat: update nodemon configuration, add worker support, and upgrade dependencies

feat: add basic frontend

feat: implement basic backend