feat(core+backend/X11): 完成快捷键绑定和触发功能

src/core/policy.h

@@ -1,6 +1,8 @@
 #pragma once
 
 #include <zdwm/action.h>
+
+#include "core/binding.h"
 #include "core/command_buffer.h"
 #include "core/event.h"
 #include "core/plan.h"
@@ -8,6 +10,7 @@
 #include "core/state.h"
 
 typedef struct policy_context_t {
+  binding_table_t *bind_table;
   state_t *state;
   const rules_t *rules;
   const zdwm_action_ctx_t action_ctx;