feat: openai response /v1/response/compact (#2644)

* feat: openai response /v1/response/compact

* feat: /v1/response/compact bill

* feat: /v1/response/compact

* feat: /v1/responses/compact -> codex channel

* feat: /v1/responses/compact -> codex channel

* feat: /v1/responses/compact -> codex channel

* feat: codex channel default models

* feat: compact model price

* feat: /v1/responses/comapct test

relay/channel/openai/relay_responses_compact.go

@@ -0,0 +1,44 @@
+package openai
+
+import (
+	"io"
+	"net/http"
+
+	"github.com/QuantumNous/new-api/common"
+	"github.com/QuantumNous/new-api/dto"
+	"github.com/QuantumNous/new-api/service"
+	"github.com/QuantumNous/new-api/types"
+
+	"github.com/gin-gonic/gin"
+)
+
+func OaiResponsesCompactionHandler(c *gin.Context, resp *http.Response) (*dto.Usage, *types.NewAPIError) {
+	defer service.CloseResponseBodyGracefully(resp)
+
+	responseBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, types.NewOpenAIError(err, types.ErrorCodeReadResponseBodyFailed, http.StatusInternalServerError)
+	}
+
+	var compactResp dto.OpenAIResponsesCompactionResponse
+	if err := common.Unmarshal(responseBody, &compactResp); err != nil {
+		return nil, types.NewOpenAIError(err, types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
+	}
+	if oaiError := compactResp.GetOpenAIError(); oaiError != nil && oaiError.Type != "" {
+		return nil, types.WithOpenAIError(*oaiError, resp.StatusCode)
+	}
+
+	service.IOCopyBytesGracefully(c, resp, responseBody)
+
+	usage := dto.Usage{}
+	if compactResp.Usage != nil {
+		usage.PromptTokens = compactResp.Usage.InputTokens
+		usage.CompletionTokens = compactResp.Usage.OutputTokens
+		usage.TotalTokens = compactResp.Usage.TotalTokens
+		if compactResp.Usage.InputTokensDetails != nil {
+			usage.PromptTokensDetails.CachedTokens = compactResp.Usage.InputTokensDetails.CachedTokens
+		}
+	}
+
+	return &usage, nil
+}