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Ethan0x0000
4321adab71
New forwarding methods on GatewayService for Anthropic platform groups: - ForwardAsResponses: accept Responses body → convert to Anthropic → forward to upstream → convert response back to Responses format. Supports both streaming (SSE event-by-event conversion) and buffered (accumulate then convert) response modes. - ForwardAsChatCompletions: chain CC→Responses→Anthropic for request, Anthropic→Responses→CC for response. Streaming uses dual state machine chain with [DONE] marker. Both methods reuse existing GatewayService infrastructure: buildUpstreamRequest, Claude Code mimicry, cache control enforcement, model mapping, and return UpstreamFailoverError for handler-level retry.