🔧 fix(xinference): update Document type to 'any' for flexibility

- Changed the type of `Document` in `XinRerankResponseDocument` from `string` to `any` to accommodate various data types.
- Updated the `RerankHandler` to handle `Document` as `any`, ensuring proper assignment based on its actual type.

These modifications enhance the handling of document data, allowing for greater versatility in response structures.

relay/channel/xinference/dto.go

 package xinference
 
 type XinRerankResponseDocument struct {
-	Document       string  `json:"document,omitempty"`
+	Document       any     `json:"document,omitempty"`
 	Index          int     `json:"index"`
 	RelevanceScore float64 `json:"relevance_score"`
 }

relay/common_handler/rerank.go

@@ -38,11 +38,17 @@ func RerankHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Respo
 			}
 			if info.ReturnDocuments {
 				var document any
-				if result.Document == "" {
+				if result.Document != nil {
+					if doc, ok := result.Document.(string); ok {
+						if doc == "" {
 							document = info.Documents[result.Index]
 						} else {
+							document = doc
+						}
+					} else {
 						document = result.Document
 					}
+				}
 				respResult.Document = document
 			}
 			jinaRespResults[i] = respResult