Feature: Hong Kong Storefront with HKD Pricing

As a visitor accessing the website from Hong Kong,
I want to see product prices in Hong Kong Dollars (HKD),
So that I can understand the cost in my local currency.

• Location/ Language switcher: add Hong Kong in Location
• Admin configures HKD in yayCurrency
• Hong Kong store checkout
• Gift Card in Hong Kong Dollars
• Emails in HKD