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

CMakeLists.txt

@@ -33,13 +33,13 @@ add_executable(${APP_NAME}
 
     ${SOURCE_DIR}/base/color.c
     ${SOURCE_DIR}/base/log.c
+    ${SOURCE_DIR}/base/process.c
     ${SOURCE_DIR}/base/window_list.c
 
     ${SOURCE_DIR}/config/defaults.c
     ${SOURCE_DIR}/config/loader.c
     ${SOURCE_DIR}/config/runtime_config.c
 
-    ${SOURCE_DIR}/core/action.c
     ${SOURCE_DIR}/core/binding.c
     ${SOURCE_DIR}/core/command_buffer.c
     ${SOURCE_DIR}/core/event.c