feat: 优化内容模板变量引用与换行展示

- 内容模板直接引用上游参数并自动维护运行参数

- 支持 Enjoy 变量标签编辑及中文变量显示

- 保留试运行与聊天运行页的模板输出换行

easyflow-ui-admin/packages/effects/common-ui/src/components/chat-markdown/__tests__/ChatTimeMarkdown.test.ts

@@ -1,7 +1,7 @@
-import {mount} from '@vue/test-utils';
-import {nextTick} from 'vue';
+import { mount } from '@vue/test-utils';
+import { nextTick } from 'vue';
 
-import {describe, expect, it, vi} from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
 
 import ChatTimeMarkdown from '../ChatTimeMarkdown.vue';
 
@@ -11,7 +11,21 @@ vi.mock('@easyflow-core/preferences', () => ({
   }),
 }));
 
-describe('ChatTimeMarkdown', () => {
+describe('chatTimeMarkdown', () => {
+  it('renders a single source line break as a visible line break', async () => {
+    const wrapper = mount(ChatTimeMarkdown, {
+      props: {
+        content: '问题：你是谁\n答案：你好',
+      },
+    });
+
+    await nextTick();
+
+    expect(wrapper.text()).toContain('问题：你是谁');
+    expect(wrapper.text()).toContain('答案：你好');
+    expect(wrapper.find('br').exists()).toBe(true);
+  });
+
   it('renders mermaid code fences with the shared mermaid block', async () => {
     const wrapper = mount(ChatTimeMarkdown, {
       props: {