AWS Bedrock anthropic.claude-opus-4-1-20250805-v1:0: added as legacy

AWS Bedrock anthropic.claude-opus-4-1-20250805-v1:0 (bedrock/anthropic.claude-opus-4-1-20250805-v1-0) is now legacy. Scheduled retirement: 2027-01-08. Verified against the provider's own published schedule.