Add mandatory fees, deposits, and surcharges as clear line items at checkout. 34 conditions, presets for Pfand, US delivery fees, CRV, and tariffs HS code

• Fixed, percentage, cost-based (COGS), and per-kg fees, per order or per product
• 34 conditions: product tags, collections, SKUs, cart total, weight, or date time
• Per-item deposits multiply by quantity: 18 bottles at 0.25 = one 4.50 fee line
• Fees appear as clear line items in cart, checkout, orders, and reports
• Presets for Pfand deposits, US retail delivery fees, CRV, tariffs, and eco fees