feat: 添加图像转视频功能

- 新增ImageToVideoParams接口定义
- 实现imageToVideo方法支持图像转视频API调用
- 使用application/x-www-form-urlencoded格式发送POST请求
- 支持img_url和duration参数配置
- 添加完整的错误处理和日志记录

src/sdk/index.ts

@@ -40,6 +40,16 @@ interface GenerateImageParams {
   img_file: string;
 }
 
+/**
+ * 图像转视频请求参数
+ */
+interface ImageToVideoParams {
+  /** 图像URL地址 */
+  img_url: string;
+  /** 视频时长，默认为0 */
+  duration?: number;
+}
+
 export function isGetFileInfoSuccessCallbackResult(val: any): val is Taro.getFileInfo.SuccessCallbackResult {
   return val && Reflect.has(val, 'digest')
 }
@@ -338,6 +348,59 @@ export class BowongAISDK {
       throw new Error(`查询任务状态失败，已重试${maxRetries}次: ${error instanceof Error ? error.message : String(error)}`);
     }
   }
+
+
+
+  /**
+   * 图像转视频
+   * @param params 图像转视频参数
+   * @returns Promise<string> 返回任务ID
+   * 
+   * 对应 curl 命令：
+   * curl -X 'POST' \
+   *   'https://bowongai-test--text-video-agent-fastapi-app.modal.run/api/custom/transform/i2v' \
+   *   -H 'accept: application/json' \
+   *   -H 'Content-Type: application/x-www-form-urlencoded' \
+   *   -d 'img_url=string&duration=0'
+   */
+  async imageToVideo(params: ImageToVideoParams): Promise<string> {
+    const { img_url, duration = 0 } = params;
+    const url = `${this.baseUrl}/api/custom/transform/i2v`;
+
+    try {
+      // 构建 form data
+      const formData = new URLSearchParams();
+      formData.append('img_url', img_url);
+      formData.append('duration', duration.toString());
+
+      const response = await Taro.request({
+        url,
+        method: 'POST',
+        header: {
+          'accept': 'application/json',
+          'Content-Type': 'application/x-www-form-urlencoded'
+        },
+        data: formData.toString()
+      });
+
+      if (response.statusCode !== 200) {
+        throw new Error(`HTTP ${response.statusCode}: 图像转视频请求失败`);
+      }
+
+      const result = response.data as ApiResponse<string>;
+
+      if (!result.status) {
+        throw new Error(result.msg || '图像转视频请求失败');
+      }
+
+      console.log('图像转视频任务提交成功:', result.data);
+      return result.data;
+
+    } catch (error) {
+      console.error('图像转视频失败:', error);
+      throw error;
+    }
+  }
 }
 
 /**