[bojemoi] feat(ml-threat): add MSF real data training loop

Commit 410ef77

Description

• New train_from_msf.py: fetches 50k hosts from MSF postgres DB (hosts+services+vulns JOIN), builds 10-feature matrix with country_risk=70 fixed, labels 0/1/2 by thresholds, mixes 20% synthetic, trains IOCClassifier + ReputationScorer
• api.py: async retrain loop (24h interval), POST /models/retrain endpoint (409 if locked), /models/reload now returns last_retrain timestamp
• stack/45: add MSF_DB_* env vars + RETRAIN_INTERVAL_HOURS

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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