Build me a functional prototype for Stockswaps - a B2B inventory swap platform for DTC brands.

Core Concept

A marketplace where DTC brands can trade dead stock with non-competing brands targeting similar demographics. No cash changes hands - brands swap inventory 1:1 based on retail value and include swapped products as "surprise gifts" in customer orders.

User Flow

1. Onboarding

• Brand signs up with company name, category (e.g., "Women's Activewear"), and target demographic info
• Connects their Shopify/inventory system (mock this with manual entry for demo)

2. List Dead Stock

Brand uploads inventory with:

• Product name and images
• SKU and quantity available
• Original retail value per unit
• Reason for dead stock (wrong size run, seasonal, failed colorway, overrun)
• Target swap categories they'd accept (e.g., "Skincare, Wellness, Home")

3. Browse & Match

• Dashboard shows potential swap matches based on:
  • Similar target demographics
  • Non-competing categories
  • Matching retail value ranges
• AI-powered matching score (0-100) based on brand alignment

4. Propose a Swap

• Select items from your inventory
• Select items from partner's inventory