fix: add fallback defaults to Settings and fix limiter import in auth router

fix: resolution of critical blockers (P0/P1/P2 fixes) - async Redis, atomic credit updates, schema compatibility, task event loop safety, rate limits, timezone datetimes

fix: all 9 production audit issues - DEBUG default, delete_account commit, guest session security, GitHub OAuth redirect, unlimited credits sentinel

fix: dynamic code audit fallback based on scanned project files

fix: resolve tab switch streaming loop and dynamic fallback design generation

fix: production readiness, security, performance, and worker refactoring

Fix database deadlocks, timezone cookie offsets, and add WeasyPrint GTK fallback safeguards

Implement OpenRouter API integration and Redis event caching/replay to fix stuck streams on tab switch

Fix auto-login, SSE streams, LLM timeouts, and frontend cancellation

fix: update LLM model names to active NVIDIA catalog and add worker thread signal fixes

feat: replace Firebase with Supabase JWT auth (ES256/JWKS + HS256 fallback)

Support Authorization Bearer token fallback for session verification

Implement guest login bypass endpoint and mock credentials validation

Fix python f-string curly brace syntax error in ai.py

Initialize Archvise API backend for Hugging Face Spaces