Remove launcher Smart Search; background batch is the only async path

refactor(launcher): consolidate Headless Search into Smart Search QStash path

Remove Claude/Gemini references

Pace headless search Serp and score steps using batch delay env vars

feat(batch): localStorage recent jobs and JSON export from status page

fix: disable Upstash auto JSON parse on GET so batch jobs load from Redis

fix: reject huggingface.co/spaces as BATCH_PUBLIC_APP_URL; document HF .hf.space URL

feat: background batch jobs with Redis, QStash, and launcher precision mode