- PHP: new 'expiry_history' action computes avg shelf life (expiry_date - added_at)
from inventory table for the same product_id (last 730 days, valid entries only)
- JS: _fetchExpiryHistoryAndUpdate() fires async after showAddForm() renders
and replaces the rule-based estimate with the historical average if available
- Labeled with '📊 storico' badge on the estimate line (tooltip shows sample count)
- recalculateAddExpiry() and selectPurchaseType('new') both honour window._historyExpiryDays
- Vacuum-sealed multiplier still applied on top of historical base
- Falls back silently to rule-based estimateExpiryDays when no history exists
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