feat: add xAI handling and response processing

common/json.go

@@ -12,3 +12,7 @@ func DecodeJson(data []byte, v any) error {
 func DecodeJsonStr(data string, v any) error {
 	return DecodeJson(StringToByteSlice(data), v)
 }
+
+func EncodeJson(v any) ([]byte, error) {
+	return json.Marshal(v)
+}