chore: clean up diagnostic print statements from main.py

debug: add print checks for prometheus.yml contents

debug: add GRAFANA_API_KEY diagnostic prints

fix: use request.url.hostname in proto middleware to resolve AttributeError

fix(observability): create prometheus multiproc dir automatically on startup

debug: add startup diagnostics for Google OAuth credentials

fix(auth): enable same_site none and https_only for cross-domain OAuth cookies

fix(auth): trust reverse proxy headers and force HTTPS scheme in production

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

fix: enforce PROMETHEUS_MULTIPROC_DIR at metrics layer top of file to fix multiprocess isolation

feat: configure prometheus multiprocess metrics collection for celery and fastapi

feat: mount prometheus metrics app on /metrics endpoint in fastapi gateway

feat: complete FastAPI gateway routes and entry point integration

feat: added files and folders