perf: optimize request metadata extraction and disabled field filtering (#5009)

* perf: optimize request metadata extraction and disabled field filtering

* perf: optimize stream usage estimation path

relay/channel/openai/relay-openai.go

@@ -119,7 +119,6 @@ func OaiStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Re
 	var responseTextBuilder strings.Builder
 	var toolCount int
 	var usage = &dto.Usage{}
-	var streamItems []string // store stream items
 	var lastStreamData string
 	var secondLastStreamData string // 存储倒数第二个stream data，用于音频模型
 
@@ -140,7 +139,10 @@ func OaiStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Re
 			}
 
 			lastStreamData = data
-			streamItems = append(streamItems, data)
+			if err := processTokenData(info.RelayMode, data, &responseTextBuilder, &toolCount); err != nil {
+				logger.LogError(c, "error processing stream token data: "+err.Error())
+				sr.Error(err)
+			}
 		}
 	})
 
@@ -175,11 +177,6 @@ func OaiStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Re
 		}
 	}
 
-	// 处理token计算
-	if err := processTokens(info.RelayMode, streamItems, &responseTextBuilder, &toolCount); err != nil {
-		logger.LogError(c, "error processing tokens: "+err.Error())
-	}
-
 	if !containStreamUsage {
 		usage = service.ResponseText2Usage(c, responseTextBuilder.String(), info.UpstreamModelName, info.GetEstimatePromptTokens())
 		usage.CompletionTokens += toolCount * 7