调用dify，解决时间问题，源语料为空的问题

src/main/java/com/rj/dto/DifyWorkflowRequestDto.java

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+package com.rj.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+
+/**
+ * Dify工作流请求DTO
+ * 
+ * @author 李中华
+ * @date 2025/1/3
+ */
+@Data
+@Schema(description = "Dify企微对话分析工作流请求参数")
+public class DifyWorkflowRequestDto {
+
+    @NotBlank(message = "企微客户unionId不能为空")
+    @Schema(description = "企微客户unionId", example = "test_union_12345", required = true)
+    private String unionId;
+
+    @NotBlank(message = "B端认证中心userId不能为空")
+    @Schema(description = "B端认证中心userId", example = "consultant_67890", required = true)
+    private String consultantId;
+
+    @NotBlank(message = "沟通时间不能为空")
+    @Schema(description = "沟通时间", example = "2025-01-03 10:30:00", required = true)
+    private String communicateDate;
+
+    @NotBlank(message = "分析场景不能为空")
+    @Schema(description = "分析场景", example = "sales_consultation", required = true)
+    private String analysisScene;
+
+    @NotBlank(message = "AI分析请求ID不能为空")
+    @Schema(description = "AI分析请求ID", example = "ai_req_20250103_001", required = true)
+    private String aiAnalysisRequestId;
+
+    @NotNull(message = "版本号不能为空")
+    @Schema(description = "版本号", example = "1", required = true)
+    private Integer version;
+
+    @NotBlank(message = "企微对话内容不能为空")
+    @Schema(description = "企微对话内容", example = "客户：你好，我想了解一下沃尔沃XC60这款车。\n顾问：您好！很高兴为您介绍沃尔沃XC60。", required = true)
+    private String chat;
+}

src/main/java/com/rj/dto/DifyWorkflowResponseDto.java

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+package com.rj.dto;
+
+import com.alibaba.fastjson.JSONObject;
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+/**
+ * Dify工作流响应DTO
+ * 
+ * @author 李中华
+ * @date 2025/1/3
+ */
+@Data
+@Schema(description = "Dify企微对话分析工作流响应结果")
+public class DifyWorkflowResponseDto {
+
+    @Schema(description = "是否成功", example = "true")
+    private Boolean success;
+
+    @Schema(description = "响应消息", example = "工作流调用成功")
+    private String message;
+
+    @Schema(description = "工作流运行ID", example = "workflow_run_12345")
+    private String workflowRunId;
+
+    @Schema(description = "任务ID", example = "task_67890")
+    private String taskId;
+
+    @Schema(description = "工作流响应数据")
+    private JSONObject data;
+
+    @Schema(description = "元数据")
+    private JSONObject metadata;
+
+    @Schema(description = "错误类型（仅在失败时返回）", example = "RuntimeException")
+    private String error;
+
+    /**
+     * 创建成功响应
+     */
+    public static DifyWorkflowResponseDto success(String workflowRunId, String taskId, JSONObject data, JSONObject metadata) {
+        DifyWorkflowResponseDto response = new DifyWorkflowResponseDto();
+        response.setSuccess(true);
+        response.setMessage("工作流调用成功");
+        response.setWorkflowRunId(workflowRunId);
+        response.setTaskId(taskId);
+        response.setData(data);
+        response.setMetadata(metadata);
+        return response;
+    }
+
+    /**
+     * 创建失败响应
+     */
+    public static DifyWorkflowResponseDto failure(String message, String error) {
+        DifyWorkflowResponseDto response = new DifyWorkflowResponseDto();
+        response.setSuccess(false);
+        response.setMessage(message);
+        response.setError(error);
+        return response;
+    }
+}