Update API.md

Author: frikky

docs/API.md

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 # Shuffle API 
 Documentation for the Shuffle API. Change https://shuffler.io with your local domain/IP for on-premises usage.
 
-- US (California): https://california.shuffler.io
-- Germany (Frankfurt): https://frankfurt.shuffler.io
+- UK (London - default): https://shuffler.io
+- Germany (Frankfurt): https://eu.shuffler.io
+- US (California): https://us.shuffler.io
 - Canada (Montréal): https://ca.shuffler.io
-- Likely regions in 2025/2026: Japan (Tokyo, asia-northeast1), Australia (Sydney, australia-southeast1), India (Mumbai, asia-south1), Brazil (São Paulo, southamerica-east1). Shuffle Regions can be deployed quickly - if you need a specific region, [please check if Google Cloud Platform (GCP) supports it](https://cloud.google.com/about/locations#americas).
+- Australia (Sydney) - **TEST REGION**: https://au.shuffler.io
+- Likely regions in 2025/2026: Japan (Tokyo, asia-northeast1), India (Mumbai, asia-south1), Brazil (São Paulo, southamerica-east1). Shuffle Regions can be deployed quickly - if you need a specific region, [please check if Google Cloud Platform (GCP) supports it](https://cloud.google.com/about/locations#americas).
 
 Check your current location on the [/admin page](https://shuffler.io). Use the dropdown menu to change regions.
 <img width="1148" alt="image" src="https://github.com/user-attachments/assets/92408590-7ba0-4ecf-891f-4799eb8ffedf" />