feat(bar): 添加状态栏 bar 模块的基础架构和 workspace 指示器

src/bar/bar.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stddef.h>
+#include <zdwm/bar.h>
+#include <zdwm/types.h>
+
+#include "bar/types.h"
+
+typedef struct bar_output_t {
+  zdwm_window_id_t window_id;
+  zdwm_output_id_t output_id;
+  bar_side_t sides[ZDWM_BAR_SIDE_COUNT];
+} bar_output_t;
+
+typedef struct bar_t {
+  bar_output_t *bars;
+  size_t count;
+
+  bool visible;
+
+  zdwm_bar_config_t config;
+} bar_t;