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-pdf/src/test/java/com/easyagents/document/pdf/mineru/MineruMapperTest.java

@@ -49,6 +49,25 @@ public class MineruMapperTest {
         Assert.assertNotNull(result.getArtifacts().getContentList());
     }
 
+    @Test
+    public void shouldMapStringifiedSyncArtifacts() {
+        MineruMapper mapper = new MineruMapper(defaultProperties());
+        MineruResultPayload payload = mapper.toResultPayload(syncPayloadWithStringifiedArtifacts());
+
+        ParseResponse response = mapper.toParseResponse(payload);
+
+        Assert.assertEquals(1, response.getResults().size());
+        ParseResult result = response.getResults().get(0);
+        Assert.assertEquals("# title", result.getMarkdown());
+        Assert.assertFalse(result.getBlocks().isEmpty());
+        Assert.assertEquals(1, result.getTables().size());
+        Assert.assertEquals(2, result.getImages().size());
+        Assert.assertNotNull(result.getImages().get(0).getContent());
+        Assert.assertTrue(result.getArtifacts().getMiddleJson() instanceof JSONObject);
+        Assert.assertTrue(result.getArtifacts().getContentList() instanceof JSONArray);
+        Assert.assertEquals("plain-model-output", result.getArtifacts().getModelOutput());
+    }
+
     @Test
     public void shouldMapZipResponse() throws IOException {
         MineruMapper mapper = new MineruMapper(defaultProperties());
@@ -292,6 +311,28 @@ public class MineruMapperTest {
         return payload;
     }
 
+    private JSONObject syncPayloadWithStringifiedArtifacts() {
+        JSONObject payload = new JSONObject();
+        payload.put("backend", "vlm-http-client");
+        payload.put("version", "3.0.9");
+
+        JSONObject result = new JSONObject();
+        result.put("md_content", "# title");
+        result.put("middle_json", middleJson().toJSONString());
+        result.put("content_list", contentList().toJSONString());
+        result.put("model_output", "plain-model-output");
+
+        JSONObject images = new JSONObject();
+        images.put("figure.png", "data:image/png;base64,ZmFrZQ==");
+        images.put("table.png", "data:image/png;base64,ZmFrZQ==");
+        result.put("images", images.toJSONString());
+
+        JSONObject results = new JSONObject();
+        results.put("demo", result.toJSONString());
+        payload.put("results", results);
+        return payload;
+    }
+
     private JSONObject middleBlock(String type, String imagePath) {
         JSONObject block = new JSONObject();
         block.put("type", type);