Manual subscription creation now finds customers who've never subscribed before

When creating a subscription manually from the admin, the customer search only looked at customers Subi already had a local record for. A real customer in your Shopify admin who had simply never subscribed before, so had no local record yet, would not show up in the search at all, making it impossible to create a manual subscription for them.

The search now also checks the shop's own Shopify customer list when a local match isn't found, so a customer who exists in your store but has no subscription history yet can be found and selected. If the same customer is found in both places, they appear once, not as a duplicate.

What's fixed: searching by name or email in the manual Create subscription flow now returns Shopify customers as well as customers already known to Subi, and selecting one loads their address and lets you complete the contract as normal. If a search to Shopify fails or is rate-limited, you'll see a notice rather than a misleading "no customers found."

This only affects finding and selecting a customer during manual subscription creation; nothing about how existing subscriptions or checkout-created customers work has changed.