refactor(policy): 删除 action 模块，将 action -> command 解析放在 policy 模块内部

- 删除 src/core/action.c|h，将 spawn 移至 src/base/process
- policy_resolve_action 实现完整的 action 分发逻辑
- binding_table_cycle_mode 改为纯计算，返回模式 ID 而非修改状态
- 从 state 移除 state_workspace_cycle_layout / state_cycle_current_output
- 新增 ZDWM_COMMAND_QUIT 命令，通过 plan 标志驱动 runtime 退出
- set_binding_mode 现在生成 BIND_KEY effect 以同步后端按键绑定
- 扩展 action 数据类型支持 window_send_to_workspace 和 window_cycle_output

include/zdwm/action.h

@@ -52,6 +52,16 @@ typedef struct zdwm_action_data_index_only_t {
   uint32_t index;
 } zdwm_action_data_index_only_t;
 
+typedef struct zdwm_action_data_window_send_to_workspace_t {
+  uint32_t index;
+  bool switch_workspace;
+} zdwm_action_data_window_send_to_workspace_t;
+
+typedef struct zdwm_action_data_window_cycle_output_t {
+  int32_t delta;
+  bool keep_focus;
+} zdwm_action_data_window_cycle_output_t;
+
 typedef struct zdwm_action_t {
   zdwm_action_type_t type;
   union {
@@ -63,8 +73,9 @@ typedef struct zdwm_action_t {
     zdwm_action_data_delta_only_t layout_cycle;
     zdwm_action_data_delta_only_t binding_mode_cycle;
     zdwm_action_data_delta_only_t window_focus_cycle;
-    zdwm_action_data_index_only_t window_send_to_workspace_same_output_by_index;
-    zdwm_action_data_delta_only_t window_cycle_output;
+    zdwm_action_data_window_send_to_workspace_t
+      window_send_to_workspace_same_output_by_index;
+    zdwm_action_data_window_cycle_output_t window_cycle_output;
   } as;
 } zdwm_action_t;