fix: 修改model参数错误

controllers/ai/ai_file.go

@@ -40,7 +40,7 @@ func (this *AiFileController) FileUpload() {
 		br.ErrMsg = "获取资源信息失败,Err:" + err.Error()
 		return
 	}
-	model := this.GetString("model")
+	model := this.GetString("Model")
 
 	aiChatTopicId, _ := this.GetInt("AiChatTopicId")