core: 添加窗口规则 (rules) 数据结构和配置接口

src/core/rules.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <stddef.h>
+
+#include "core/types.h"
+
+typedef struct rule_item_t {
+  rule_match_t match;
+  rule_action_t action;
+} rule_item_t;
+
+typedef struct rules_t {
+  rule_item_t *items;
+  size_t count;
+  size_t capacity;
+} rules_t;
+
+bool rules_move(rules_t *dest, rules_t *src);
+void rules_cleanup(rules_t *rules);