feat: add missing fields to DetailedDocumentResponse (#160)

Add doc_type, doc_metadata, summary_index_status, and need_summary fields
to align with the latest Dify API response for document detail endpoint.

Author: imfangs

src/main/java/io/github/imfangs/dify/client/model/datasets/DetailedDocumentResponse.java

@@ -167,6 +167,18 @@ public class DetailedDocumentResponse {
     @JsonProperty("display_status")
     private String displayStatus;
 
+    /**
+     * 文档类型
+     */
+    @JsonProperty("doc_type")
+    private String docType;
+
+    /**
+     * 文档元数据详情列表
+     */
+    @JsonProperty("doc_metadata")
+    private List<Map<String, Object>> docMetadata;
+
     /**
      * 文档形式
      */
@@ -179,6 +191,18 @@ public class DetailedDocumentResponse {
     @JsonProperty("doc_language")
     private String docLanguage;
 
+    /**
+     * 摘要索引状态
+     */
+    @JsonProperty("summary_index_status")
+    private String summaryIndexStatus;
+
+    /**
+     * 是否需要摘要
+     */
+    @JsonProperty("need_summary")
+    private Boolean needSummary;
+
     /**
      * 处理规则信息
      */