Enhance OpenAI Provider Request Body with Thinking Parameter

- Added support for a new "thinking" parameter in the request body for models that support reasoning/thinking mode, improving functionality.
- Updated the request body construction to include debugging output for the full request body, aiding in troubleshooting and development.
- Ensured that the model and other settings are retrieved from the connector, maintaining consistency in configuration handling.

agent/llm/providers/openai/openai.go

@@ -1039,13 +1039,19 @@ func (p *Provider) buildRequestBody(messages []context.Message, options *context
 		return nil, fmt.Errorf("options are required")
 	}
 
-	// Get model from connector settings
+	// Get model and other settings from connector
 	setting := p.Connector.Setting()
 	model, ok := setting["model"].(string)
 	if !ok || model == "" {
 		return nil, fmt.Errorf("model is not set in connector")
 	}
 
+	// Get thinking setting from connector (for models that support reasoning/thinking mode)
+	var thinkingSetting interface{}
+	if thinking, exists := setting["thinking"]; exists {
+		thinkingSetting = thinking
+	}
+
 	// Convert messages to API format
 	apiMessages := make([]map[string]interface{}, 0, len(messages))
 	for _, msg := range messages {
@@ -1202,6 +1208,17 @@ func (p *Provider) buildRequestBody(messages []context.Message, options *context
 		body["audio"] = options.Audio
 	}
 
+	// Add thinking parameter for models that support reasoning/thinking mode
+	if thinkingSetting != nil {
+		body["thinking"] = thinkingSetting
+		fmt.Printf("[DEBUG] Adding thinking parameter to request: %+v\n", thinkingSetting)
+	}
+
+	// Debug: Print full request body
+	if bodyJSON, err := jsoniter.MarshalIndent(body, "", "  "); err == nil {
+		fmt.Printf("[DEBUG] Request body:\n%s\n", string(bodyJSON))
+	}
+
 	return body, nil
 }