Merge remote-tracking branch 'upstream/main'

# Conflicts:
#	backend/internal/service/openai_gateway_messages.go

backend/internal/service/openai_gateway_messages.go

@@ -40,6 +40,7 @@ func (s *OpenAIGatewayService) ForwardAsAnthropic(
 		return nil, fmt.Errorf("parse anthropic request: %w", err)
 	}
 	originalModel := anthropicReq.Model
+	applyOpenAICompatModelNormalization(&anthropicReq)
 	clientStream := anthropicReq.Stream // client's original stream preference
 
 	// 2. Convert Anthropic → Responses