V46: Product Options with Dynamic Pricing + Import Logs + Translations

This migration adds:

• phoenix_kit_shop_config table for global Shop configuration
• option_schema JSONB column to categories for category-specific options
• image_id BIGINT column to categories for Storage media integration
• featured_image_id and image_ids columns to products for Storage integration
• selected_specs JSONB column to cart_items for specification storage
• phoenix_kit_shop_import_logs table for CSV import history tracking
• translations JSONB column to products and categories for multi-language support

Option Schema Format

Options support dynamic pricing with two modifier types:

%{
  "key" => "material",
  "label" => "Material",
  "type" => "select",
  "options" => ["PLA", "ABS", "PETG"],
  "affects_price" => true,
  "modifier_type" => "fixed",  # "fixed" or "percent"
  "price_modifiers" => %{
    "PLA" => "0",
    "ABS" => "5.00",
    "PETG" => "10.00"
  }
}

Price Calculation Order

1. Sum all fixed modifiers
2. Add to base price (intermediate price)
3. Sum all percent modifiers
4. Apply percent to intermediate price

Example: Base $20 + PETG ($10 fixed) + Premium (20% percent) Result: ($20 + $10) * 1.20 = $36