feat(amazon-bedrock-mantle): add Claude Opus 4.7 via per-model Anthropic Messages API override (#68730) * feat(amazon-bedrock-mantle): add Claude Opus 4.7 via Anthropic auth * fix(amazon-bedrock-mantle): keep Opus 4.7 transport-safe * fix(amazon-bedrock-mantle): restore anthropic base url helper * fix(auto-reply): apply runtime auth to conversation labels --------- Co-authored-by: Vincent Koc <vincentkoc@ieee.org>