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/event.h

@@ -64,9 +64,16 @@ typedef struct pointer_enter_event_t {
 
 typedef struct window_map_request_event_t {
   window_id_t window;
-  window_props_t props;
+  window_id_t transient_for;
+  bool override_redirect;
+  bool skip_taskbar;
+  bool urgent;
+  bool fixed_size;
+  window_geometry_mode_t geometry_mode;
+  rect_t rect;
+
+  window_layer_props_t props;
   window_metadata_t metadata;
-  window_geometry_t geometry;
 } window_map_request_event_t;
 
 typedef enum window_remove_reason_t {