backend: X11 后端 window 信息查询接口使用原始封装代替语义化封装

- 拆分 window_get_skip_taskbar / window_get_urgency /
  window_get_states / window_get_geometry_mode 为更底层的
  window_get_atom_array / window_get_wm_hints / atom_to_window_state
- window_get_fixed_size 改为输出参数风格
- 扁平化 window_map_request_event_t，内联原 window_props_t 和
  window_geometry_t 的字段
- window_props_t → window_layer_props_t，仅保留 layer 分类所需的
  types/states

src/core/layer.c

@@ -88,7 +88,7 @@ bool layer_stack_lower(layer_stack_t *layer, window_id_t window) {
   return true;
 }
 
-layer_type_t layer_classify(const window_props_t *props) {
+layer_type_t layer_classify(const window_layer_props_t *props) {
   for (size_t i = 0; i < props->type_count; ++i) {
     window_type_t type = props->types[i];
     if (type == ZDWM_WINDOW_TYPE_NOTIFICATION) return ZDWM_WINDOW_LAYER_OVERLAY;