feat: Add Findagram and FindADispo consumer frontends

- Add findagram.co React frontend with product search, brands, categories
- Add findadispo.com React frontend with dispensary locator
- Wire findagram to backend /api/az/* endpoints
- Update category/brand links to route to /products with filters
- Add k8s manifests for both frontends
- Add multi-domain user support migrations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

findagram/backend/app/models/__init__.py

@@ -0,0 +1,4 @@
+from app.models.user import User
+from app.models.product import Product, Dispensary, ProductPrice, Category, Brand
+
+__all__ = ["User", "Product", "Dispensary", "ProductPrice", "Category", "Brand"]