Fix htmx auth: get_current_user falls back to nexustoken cookie; fix null hyperscript alerts; add JSONResponse import

Fix async_session_maker None bug: mutable proxy object so all 40+ module-level imports track state

Fix URL resolution: auto-detect postgresql:// -> +asyncpg/+psycopg2, default to SQLite, non-fatal alembic

Add SQLite support, TTS/STT endpoints, db_utils helper

Fix 6 critical runtime bugs, wire up realtime WebSocket, fix semantic cache & load balancer, expand code interpreter & config backup, add scraper.py, integrate google-antigravity SDK

REBUILD