Seed demo LLM analysis reports by UI language.

Add default LLM settings with LLM_API_KEY from environment

Fix logout button i18n on manager page

Add language switch on login page with English as default

Set default UI language to English for HF demo

Fix FastAPI deprecation warnings and lengthen demo SECRET_KEY

Add show/hide password toggle on login page

Fix login redirect by setting auth cookie and routing by role

Pre-fill demo admin credentials on login page

Add demo defaults and usage instructions for HF Space

Add Hugging Face Space deployment