Add Elliot-based Onboarding

Other Features

• api: Allow toggling product event flag via products PATCH
• design: Introduce Design Sessions, consolidating the feedback flow
• Elliot v2 prompt adjustment
• furgonetka: Auto-generate shipping labels on paid orders
• furgonetka: Make Map script env-aware and add configurable Map API key
• orders: De-emphasize manual order status control
• orders: Redesign order-detail panel header for prominence
• products: Move category into name subtitle, refine translation badges
• shipping: Add merchant opt-out for customer tracking emails
• shipping: Carrier-event tracking emails + shipment timeline