fix: add missing uuid id generation for new Google OAuth users

fix: correct avatar_url field name in Google OAuth callback; add pool_pre_ping for Neon connection stability

fix(auth): add fallback profile fetch from Google userinfo API

fix(auth): implement manual state restoration fallback for OAuth callback

feat(api): filter cases by authenticated user and protect endpoints

feat(api): add endpoint to list past cases

feat(auth): implement Google OAuth and Email/Password authentication

feat: migrate decompose route to enqueue async celery jobs with 202 accepted response

feat: complete FastAPI gateway routes and entry point integration

feat: added files and folders