feat(flow-editor): 默认卡片模式，画布降级为高级入口

src/views/flow/admin/def-editor/index.vue

@@ -73,7 +73,7 @@ const routers = reactive<RouterOption[]>([]);
  *   DAG 等）拒绝切卡片，留在画布编辑。
  */
 /** 编辑形态：canvas=bpmn-js 画布（支持多出口/跨段连线），cards=卡片流 */
-const editMode = ref<"canvas" | "cards">("canvas");
+const editMode = ref<"canvas" | "cards">("cards");
 /** 画布侧数据是否可反解为卡片树（载入时探测，决定卡片单选是否可用） */
 const cardsBroken = ref(false);
 const bpmnWrap = ref<InstanceType<typeof BpmnCanvas> | null>(null);
@@ -816,8 +816,8 @@ onUnmounted(() => window.removeEventListener("beforeunload", onBeforeUnload));
             </div>
             <div class="hd-right">
                 <RadioGroup :model-value="editMode" size="small" type="button" @on-change="onModeSwitch">
-                    <Radio label="canvas">画布</Radio>
-                    <Radio label="cards" :disabled="cardsBroken">卡片</Radio>
+                    <Radio label="cards">卡片（推荐）</Radio>
+                    <Radio label="canvas" :disabled="cardsBroken">画布（高级）</Radio>
                 </RadioGroup>
                 <Button @click="settingsDrawer = true">流程设置</Button>
                 <Button @click="jsonDrawer = true">源码</Button>