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Approach A2 (Client Portal Web API + OAuth 1.0a Self-Service): fully unattended REST con setup iniziale one-time, niente sidecar Java. Scope V1 include: simple+complex orders (bracket/OCO/OTO), WebSocket streaming snapshot-on-demand (tick+depth), key rotation semi-automatica con auto-rollback. 8-commit plan atomico, ~6-8 giorni dev. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>