feat(automations): auto-email invoice on wire-transfer placed and on fulfillment

- New ShopSettings fields: autoEmailOnWireTransferPlaced,
  autoEmailOnFulfilledNonWireTransfer, wireTransferGatewayNames.
- New Automations section in settings with two toggles + gateway list.
- orders/create webhook now fires automation 1 (wire-transfer placed).
- New orders/fulfilled webhook fires automation 2 (non-wire-transfer fulfilled).
- Shared helper services/invoice/automations.server.ts handles classification
  and idempotent generate+send (skips if already sent).
- Webhook subscription for orders/fulfilled added to all 3 app tomls.

This is the non-Plus fallback for Shopify Flow, whose custom-app actions
are gated to Plus stores only.

shopify.app.dev.toml

@@ -31,6 +31,10 @@ api_version = "2026-07"
   uri = "/webhooks/orders/updated"
   topics = [ "orders/updated" ]
 
+  [[webhooks.subscriptions]]
+  uri = "/webhooks/orders/fulfilled"
+  topics = [ "orders/fulfilled" ]
+
 [auth]
 redirect_urls = [
   "https://invoice-app-dev.linumiq.com/auth/callback",