feat: Add thinking-to-content conversion for stream responses

dto/openai_response.go

@@ -86,6 +86,10 @@ func (c *ChatCompletionsStreamResponseChoiceDelta) GetReasoningContent() string
 	return *c.ReasoningContent
 }
 
+func (c *ChatCompletionsStreamResponseChoiceDelta) SetReasoningContent(s string) {
+	c.ReasoningContent = &s
+}
+
 type ToolCall struct {
 	// Index is not nil only in chat completion chunk object
 	Index    *int         `json:"index,omitempty"`
@@ -116,6 +120,20 @@ type ChatCompletionsStreamResponse struct {
 	Usage             *Usage                                `json:"usage"`
 }
 
+func (c *ChatCompletionsStreamResponse) Copy() *ChatCompletionsStreamResponse {
+	choices := make([]ChatCompletionsStreamResponseChoice, len(c.Choices))
+	copy(choices, c.Choices)
+	return &ChatCompletionsStreamResponse{
+		Id:                c.Id,
+		Object:            c.Object,
+		Created:           c.Created,
+		Model:             c.Model,
+		SystemFingerprint: c.SystemFingerprint,
+		Choices:           choices,
+		Usage:             c.Usage,
+	}
+}
+
 func (c *ChatCompletionsStreamResponse) GetSystemFingerprint() string {
 	if c.SystemFingerprint == nil {
 		return ""