fix: restore Claude file conversion and preserve stream status

relay/channel/claude/relay-claude.go

@@ -1,11 +1,13 @@
 package claude
 
 import (
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
 	"strings"
+	"unicode/utf8"
 
 	"github.com/QuantumNous/new-api/common"
 	"github.com/QuantumNous/new-api/constant"
@@ -35,6 +37,21 @@ func stopReasonClaude2OpenAI(reason string) string {
 	return reasonmap.ClaudeStopReasonToOpenAIFinishReason(reason)
 }
 
+func inferClaudeFileMimeType(file *dto.MessageFile) string {
+	if file == nil || file.FileName == "" {
+		return ""
+	}
+	dot := strings.LastIndex(file.FileName, ".")
+	if dot == -1 || dot+1 >= len(file.FileName) {
+		return ""
+	}
+	mimeType := service.GetMimeTypeByExtension(file.FileName[dot+1:])
+	if mimeType == "application/octet-stream" {
+		return ""
+	}
+	return mimeType
+}
+
 func maybeMarkClaudeRefusal(c *gin.Context, stopReason string) {
 	if c == nil {
 		return
@@ -377,7 +394,16 @@ func RequestOpenAI2ClaudeMessage(c *gin.Context, textRequest dto.GeneralOpenAIRe
 							})
 						}
 						default:
-						source := mediaMessage.ToFileSource()
+							var source types.FileSource
+							if mediaMessage.Type == dto.ContentTypeFile {
+								file := mediaMessage.GetFile()
+								if file == nil || file.FileData == "" {
+									continue
+								}
+								source = types.NewFileSourceFromData(file.FileData, inferClaudeFileMimeType(file))
+							} else {
+								source = mediaMessage.ToFileSource()
+							}
 							if source == nil {
 								continue
 							}
@@ -385,6 +411,25 @@ func RequestOpenAI2ClaudeMessage(c *gin.Context, textRequest dto.GeneralOpenAIRe
 							if err != nil {
 								return nil, fmt.Errorf("get file data failed: %s", err.Error())
 							}
+							if mimeType == "text/plain" {
+								decoded, err := base64.StdEncoding.DecodeString(base64Data)
+								if err != nil {
+									return nil, fmt.Errorf("decode text file data failed: %s", err.Error())
+								}
+								if utf8.Valid(decoded) {
+									text := string(decoded)
+									if text != "" {
+										claudeMediaMessages = append(claudeMediaMessages, dto.ClaudeMediaMessage{
+											Type: "text",
+											Text: common.GetPointer[string](text),
+										})
+									}
+								}
+								continue
+							}
+							if mimeType == "" || mimeType == "application/octet-stream" {
+								continue
+							}
 							claudeMediaMessage := dto.ClaudeMediaMessage{
 								Source: &dto.ClaudeMessageSource{
 									Type: "base64",

relay/helper/stream_scanner.go

@@ -40,8 +40,10 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 		return
 	}
 
-	// 无条件新建 StreamStatus
+	// 保留调用方预先注入的 StreamStatus，避免覆盖已有错误/状态。
+	if info.StreamStatus == nil {
 		info.StreamStatus = relaycommon.NewStreamStatus()
+	}
 
 	// 确保响应体总是被关闭
 	defer func() {