feat(annotation): 添加模板示例数据配置功能

- 在模板配置表单中新增示例数据输入区域
- 实现不同数据类型的示例输入框（文本、图片、音频、视频等）
- 添加图片类型示例的实时预览功能
- 在模板详情页增加示例数据预览卡片
- 支持多种媒体类型的示例展示（图片、音频、视频、文本）
- 更新前后端数据模型以支持exampleData字段
- 添加示例数据的placeholder提示文案

frontend/src/pages/DataAnnotation/Template/TemplateDetail.tsx

@@ -1,5 +1,5 @@
 import React from "react";
-import { Modal, Descriptions, Tag, Space, Divider, Card, Typography } from "antd";
+import { Modal, Descriptions, Tag, Space, Divider, Card, Typography, Image, Empty } from "antd";
 import type { AnnotationTemplate } from "../annotation.model";
 
 const { Text, Paragraph } = Typography;
@@ -81,6 +81,69 @@ const TemplateDetail: React.FC<TemplateDetailProps> = ({
                 </Space>
             </Card>
 
+            {/* 示例数据预览 */}
+            <Card title="示例数据预览" size="small" style={{ marginBottom: 16 }}>
+                {template.configuration.exampleData &&
+                Object.keys(template.configuration.exampleData).length > 0 ? (
+                    <Space direction="vertical" style={{ width: "100%" }} size="middle">
+                        {template.configuration.objects.map((obj, index) => {
+                            const varName = obj.value?.replace(/^\$/, "") || obj.name;
+                            const exampleValue = template.configuration.exampleData?.[varName];
+
+                            if (!exampleValue) return null;
+
+                            return (
+                                <Card key={index} size="small" type="inner">
+                                    <Space direction="vertical" style={{ width: "100%" }}>
+                                        <div>
+                                            <Text strong>{obj.name}</Text>
+                                            <Text type="secondary" style={{ marginLeft: 8 }}>
+                                                ({obj.type})
+                                            </Text>
+                                        </div>
+                                        {/* 根据类型渲染不同的预览 */}
+                                        {obj.type === "Image" ? (
+                                            <Image
+                                                src={exampleValue}
+                                                alt={`示例: ${obj.name}`}
+                                                style={{ maxHeight: 200, maxWidth: "100%" }}
+                                                fallback="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMIAAADDCAYAAADQvc6UAAABRWlDQ1BJQ0MgUHJvZmlsZQAAKJFjYGASSSwoyGFhYGDIzSspCnJ3UoiIjFJgf8LAwSDCIMogwMCcmFxc4BgQ4ANUwgCjUcG3awyMIPqyLsis7PPOq3QdDFcvjV3jOD1boQVTPQrgSkktTgbSf4A4LbmgqISBgTEFyFYuLykAsTuAbJEioKOA7DkgdjqEvQHEToKwj4DVhAQ5A9k3gGyB5IxEoBmML4BsnSQk8XQkNtReEOBxcfXxUQg1Mjc0dyHgXNJBSWpFCYh2zi+oLMpMzyhRcASGUqqCZ16yno6CkYGRAQMDKMwhqj/fAIcloxgHQqxAjIHBEugw5sUIsSQpBobtQPdLciLEVJYzMPBHMDBsayhILEqEO4DxG0txmrERhM29nYGBddr//5/DGRjYNRkY/l7////39v///y4Dmn+LgesAAN4TeleOJA8AAAA="
+                                            />
+                                        ) : obj.type === "Audio" ? (
+                                            <audio
+                                                src={exampleValue}
+                                                controls
+                                                style={{ width: "100%" }}
+                                            />
+                                        ) : obj.type === "Video" ? (
+                                            <video
+                                                src={exampleValue}
+                                                controls
+                                                style={{ maxHeight: 200, maxWidth: "100%" }}
+                                            />
+                                        ) : (
+                                            <Paragraph
+                                                style={{
+                                                    background: "#f5f5f5",
+                                                    padding: 12,
+                                                    borderRadius: 4,
+                                                    margin: 0,
+                                                    whiteSpace: "pre-wrap",
+                                                }}
+                                            >
+                                                {exampleValue}
+                                            </Paragraph>
+                                        )}
+                                    </Space>
+                                </Card>
+                            );
+                        })}
+                    </Space>
+                ) : (
+                    <Empty description="暂无示例数据" image={Empty.PRESENTED_IMAGE_SIMPLE} />
+                )}
+            </Card>
+
             <Card title="标注控件" size="small" style={{ marginBottom: 16 }}>
                 <Space direction="vertical" style={{ width: "100%" }} size="middle">
                     {template.configuration.labels.map((label, index) => (

frontend/src/pages/DataAnnotation/annotation.model.ts

@@ -53,6 +53,12 @@ export interface TemplateConfiguration {
   labels: LabelDefinition[];
   objects: ObjectDefinition[];
   metadata?: Record<string, any>;
+  /**
+   * 示例数据，用于模板预览
+   * key: 变量名（不带$前缀，如 "image"、"text"）
+   * value: 示例内容（URL 或文本）
+   */
+  exampleData?: Record<string, string>;
 }
 
 export interface AnnotationTemplate {

frontend/src/pages/DataAnnotation/components/TemplateConfigurationForm.tsx

@@ -8,11 +8,15 @@ import {
   Divider,
   Card,
   Checkbox,
+  Typography,
+  Image,
 } from "antd";
 import { PlusOutlined, MinusCircleOutlined } from "@ant-design/icons";
 import TagSelector from "../Template/components/TagSelector";
 
 const { Option } = Select;
+const { TextArea } = Input;
+const { Text } = Typography;
 
 interface TemplateConfigurationFormProps {
   form: any;
@@ -27,6 +31,31 @@ const TemplateConfigurationForm: React.FC<TemplateConfigurationFormProps> = ({
     );
   };
 
+  /** 判断对象类型是否为文本类 */
+  const isTextType = (type: string) => {
+    return ["Text", "HyperText", "Table", "List"].includes(type);
+  };
+
+  /** 判断对象类型是否为图片类 */
+  const isImageType = (type: string) => {
+    return ["Image"].includes(type);
+  };
+
+  /** 获取示例数据输入提示 */
+  const getExamplePlaceholder = (type: string) => {
+    const map: Record<string, string> = {
+      Text: "输入示例文本内容...",
+      HyperText: "输入示例 HTML 内容...",
+      Image: "输入图片 URL，如 https://example.com/image.jpg",
+      Audio: "输入音频 URL，如 https://example.com/audio.mp3",
+      Video: "输入视频 URL，如 https://example.com/video.mp4",
+      Table: "输入示例表格数据（JSON 格式）...",
+      List: "输入示例列表数据（JSON 格式）...",
+      TimeSeries: "输入时间序列数据 URL...",
+    };
+    return map[type] || "输入示例数据...";
+  };
+
   return (
     <>
       <Divider orientation="left">数据对象</Divider>
@@ -287,6 +316,78 @@ const TemplateConfigurationForm: React.FC<TemplateConfigurationFormProps> = ({
           </>
         )}
       </Form.List>
+
+      <Divider orientation="left">示例数据（可选）</Divider>
+      <Card size="small" style={{ marginBottom: 16 }}>
+        <Text type="secondary" style={{ display: "block", marginBottom: 16 }}>
+          为数据对象提供示例数据，帮助用户在模板预览时直观了解标注效果
+        </Text>
+        <Form.Item noStyle shouldUpdate={(prev, curr) => prev.objects !== curr.objects}>
+          {({ getFieldValue }) => {
+            const objects = getFieldValue("objects") || [];
+            if (objects.length === 0) {
+              return (
+                <Text type="secondary">请先添加数据对象</Text>
+              );
+            }
+            return (
+              <Space direction="vertical" style={{ width: "100%" }} size="middle">
+                {objects.map((obj: any, index: number) => {
+                  if (!obj?.name) return null;
+                  const varName = obj.value?.replace(/^\$/, "") || obj.name;
+                  const objType = obj.type || "Text";
+
+                  return (
+                    <Card key={index} size="small" type="inner">
+                      <Space direction="vertical" style={{ width: "100%" }}>
+                        <div>
+                          <Text strong>{obj.name}</Text>
+                          <Text type="secondary" style={{ marginLeft: 8 }}>
+                            ({objType})
+                          </Text>
+                        </div>
+                        <Form.Item
+                          name={["exampleData", varName]}
+                          style={{ marginBottom: 0 }}
+                        >
+                          {isTextType(objType) ? (
+                            <TextArea
+                              rows={3}
+                              placeholder={getExamplePlaceholder(objType)}
+                            />
+                          ) : (
+                            <Input placeholder={getExamplePlaceholder(objType)} />
+                          )}
+                        </Form.Item>
+                        {/* 图片类型显示预览 */}
+                        <Form.Item noStyle shouldUpdate>
+                          {({ getFieldValue: getVal }) => {
+                            const url = getVal(["exampleData", varName]);
+                            if (isImageType(objType) && url) {
+                              return (
+                                <div style={{ marginTop: 8 }}>
+                                  <Text type="secondary" style={{ fontSize: 12 }}>预览：</Text>
+                                  <Image
+                                    src={url}
+                                    alt="示例图片预览"
+                                    style={{ maxHeight: 150, maxWidth: "100%", marginTop: 4 }}
+                                    fallback="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAMIAAADDCAYAAADQvc6UAAABRWlDQ1BJQ0MgUHJvZmlsZQAAKJFjYGASSSwoyGFhYGDIzSspCnJ3UoiIjFJgf8LAwSDCIMogwMCcmFxc4BgQ4ANUwgCjUcG3awyMIPqyLsis7PPOq3QdDFcvjV3jOD1boQVTPQrgSkktTgbSf4A4LbmgqISBgTEFyFYuLykAsTuAbJEioKOA7DkgdjqEvQHEToKwj4DVhAQ5A9k3gGyB5IxEoBmML4BsnSQk8XQkNtReEOBxcfXxUQg1Mjc0dyHgXNJBSWpFCYh2zi+oLMpMzyhRcASGUqqCZ16yno6CkYGRAQMDKMwhqj/fAIcloxgHQqxAjIHBEugw5sUIsSQpBobtQPdLciLEVJYzMPBHMDBsayhILEqEO4DxG0txmrERhM29nYGBddr//5/DGRjYNRkY/l7////39v///y4Dmn+LgesAAN4TeleOJA8AAAA="
+                                  />
+                                </div>
+                              );
+                            }
+                            return null;
+                          }}
+                        </Form.Item>
+                      </Space>
+                    </Card>
+                  );
+                })}
+              </Space>
+            );
+          }}
+        </Form.Item>
+      </Card>
     </>
   );
 };

runtime/datamate-python/app/module/annotation/schema/template.py

@@ -35,6 +35,11 @@ class TemplateConfiguration(BaseModel):
     labels: List[LabelDefinition] = Field(description="标签定义列表")
     objects: List[ObjectDefinition] = Field(description="对象定义列表")
     metadata: Optional[Dict[str, Any]] = Field(None, description="额外元数据")
+    example_data: Optional[Dict[str, str]] = Field(
+        None,
+        alias="exampleData",
+        description="示例数据，key 为变量名（不带$），value 为示例内容"
+    )
 
     model_config = ConfigDict(populate_by_name=True)