feat(backup): liga o pg_backup.sh (existia mas nunca era lancado) + restore remoto no arranque

fix: converte scripts para LF (Unix), adiciona .gitattributes

fix: pre-warm ThinkingEngine usa think() correto, fallback cot_max_tokens=800, pg_ctlcluster 15

perf: otimizações de performance - 2 workers, CoT skip trivial, MAX_ROUNDS=1, tools por relevância, blacklist 1h

fix: persistir PostgreSQL no Storage Bucket do HF Spaces

fix: reduce uvicorn workers from 2 to 1 to fit 16GB memory (models loaded once instead of twice)

fix: lock timeout 30s + training worker + PostgreSQL setup