fix: quality, size or style are not supported by xAI API

relay/channel/xai/dto.go

@@ -12,3 +12,16 @@ type ChatCompletionResponse struct {
 	Usage             *dto.Usage `json:"usage"`
 	SystemFingerprint string     `json:"system_fingerprint"`
 }
+
+// quality, size or style are not supported by xAI API at the moment.
+type ImageRequest struct {
+	Model          string          `json:"model"`
+	Prompt         string          `json:"prompt" binding:"required"`
+	N              int             `json:"n,omitempty"`
+	// Size           string          `json:"size,omitempty"`
+	// Quality        string          `json:"quality,omitempty"`
+	ResponseFormat string          `json:"response_format,omitempty"`
+	// Style          string          `json:"style,omitempty"`
+	// User           string          `json:"user,omitempty"`
+	// ExtraFields    json.RawMessage `json:"extra_fields,omitempty"`
+}