refactor: 收敛文档 OCR 配置并补齐 Office 解析兼容

- 统一 MinerU OCR 配置结构并移除分模块冗余属性类

- 补齐 JSON 字符串化结果拆包、XLSX 图片兼容与对应回归测试

easy-agents-document/easy-agents-document-pptx/src/test/java/com/easyagents/document/pptx/mineru/MineruPptxDocumentParseServiceTest.java

@@ -81,6 +81,29 @@ public class MineruPptxDocumentParseServiceTest {
         Assert.assertEquals(1, taskInfo.getResult().getResults().size());
     }
 
+    @Test
+    public void shouldSupportStringifiedMineruSlideArtifacts() throws IOException {
+        RecordingClient client = new RecordingClient(defaultProperties(), true);
+        MineruMapper mapper = new MineruMapper(defaultProperties());
+        MineruPptxDocumentParseService service = new MineruPptxDocumentParseService(
+            defaultProperties(),
+            client,
+            mapper,
+            new DocumentAsyncTaskManager(new InMemoryDocumentAsyncTaskRepository(), directExecutor())
+        );
+
+        PptxParseRequest request = new PptxParseRequest();
+        request.addFile(ParseFile.of("demo.pptx", buildPptxBytes()));
+
+        ParseResponse response = service.parse(request);
+
+        Assert.assertEquals(1, response.getResults().size());
+        ParseResult result = response.getResults().get(0);
+        Assert.assertTrue(result.getMarkdown().contains("slide-ocr-1"));
+        Assert.assertFalse(result.getBlocks().isEmpty());
+        Assert.assertEquals(2, result.getImages().size());
+    }
+
     private byte[] buildPptxBytes() throws IOException {
         XMLSlideShow slideShow = new XMLSlideShow();
         slideShow.setPageSize(new java.awt.Dimension(640, 360));
@@ -117,9 +140,15 @@ public class MineruPptxDocumentParseServiceTest {
     private static class RecordingClient extends MineruClient {
 
         private int parseCount;
+        private final boolean stringifyArtifacts;
 
         private RecordingClient(MineruProperties properties) {
+            this(properties, false);
+        }
+
+        private RecordingClient(MineruProperties properties, boolean stringifyArtifacts) {
             super(properties, new MineruMapper(properties));
+            this.stringifyArtifacts = stringifyArtifacts;
         }
 
         @Override
@@ -134,10 +163,10 @@ public class MineruPptxDocumentParseServiceTest {
             payload.put("version", "3.0.9");
             JSONObject result = new JSONObject();
             result.put("md_content", "slide-ocr-" + index);
-            result.put("middle_json", middleJson());
-            result.put("content_list", contentList(index));
+            result.put("middle_json", stringifyArtifacts ? middleJson().toJSONString() : middleJson());
+            result.put("content_list", stringifyArtifacts ? contentList(index).toJSONString() : contentList(index));
             JSONObject results = new JSONObject();
-            results.put("slide-" + index, result);
+            results.put("slide-" + index, stringifyArtifacts ? result.toJSONString() : result);
             payload.put("results", results);
             return payload;
         }