[breaking] Azure AI Foundry retires DeepSeek-R1 on 2026-08-13

Azure AI Foundry lists DeepSeek-R1 as legacy with retirement on 2026-08-13; suggested replacement: DeepSeek-V4-Pro. Azure retirement dates are platform-specific and may differ from the model provider's own schedule. The page does not date the announcements; announced_at reflects the page capture date. Effective: 2026-08-13. Migration target: microsoft/DeepSeek-V4-Pro. Affected: microsoft/DeepSeek-R1. Severity: breaking. Verification: verified.