feat(policy): 处理 ConfigureRequest 事件

src/core/policy.h

@@ -5,6 +5,7 @@
 #include "core/binding.h"
 #include "core/command_buffer.h"
 #include "core/event.h"
+#include "core/layout.h"
 #include "core/plan.h"
 #include "core/rules.h"
 #include "core/state.h"
@@ -13,6 +14,7 @@ typedef struct policy_context_t {
   binding_table_t *bind_table;
   state_t *state;
   const rules_t *rules;
+  const layout_registry_t *layouts;
   const zdwm_action_ctx_t action_ctx;
 } policy_context_t;