fix: search-preview model web search billing

dto/openai_request.go

@@ -53,6 +53,7 @@ type GeneralOpenAIRequest struct {
 	Audio            any               `json:"audio,omitempty"`
 	EnableThinking   any               `json:"enable_thinking,omitempty"` // ali
 	ExtraBody        any               `json:"extra_body,omitempty"`
+	WebSearchOptions *WebSearchOptions `json:"web_search_options,omitempty"`
 }
 
 type ToolCallRequest struct {
@@ -371,6 +372,11 @@ func (m *Message) ParseContent() []MediaContent {
 	return contentList
 }
 
+type WebSearchOptions struct {
+	SearchContextSize string          `json:"search_context_size,omitempty"`
+	UserLocation      json.RawMessage `json:"user_location,omitempty"`
+}
+
 type OpenAIResponsesRequest struct {
 	Model              string               `json:"model"`
 	Input              json.RawMessage      `json:"input,omitempty"`