Convert pipe-separated reasoning codes to structured JSON format for:
- Safety stock calculator (statistical calculations, errors)
- Price forecaster (procurement recommendations, volatility)
- Order optimization (EOQ, tier pricing)
This enables i18n translation of internal calculation reasoning
and provides structured data for frontend AI insights display.
Benefits:
- Consistent with PO/Batch reasoning_data format
- Frontend can translate using same i18n infrastructure
- Structured parameters enable rich UI visualization
- No legacy string parsing needed
Changes:
- safety_stock_calculator.py: Replace reasoning str with reasoning_data dict
- price_forecaster.py: Convert recommendation reasoning to structured format
- optimization.py: Update EOQ and tier pricing to use reasoning_data
Part of complete i18n implementation for AI insights.
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