feat(manuscript): 稿件正文增加 content_format 格式标记

- cms_manuscript 新增 content_format（html/markdown/text），默认 html
- Manuscript 实体加 contentFormat；保存与修改时缺省按 html 落库，下游不再靠猜
- 迁移脚本幂等，并把明显是 markdown 的历史行标出来

src/main/java/com/gxwebsoft/cms/controller/ManuscriptController.java

@@ -19,6 +19,7 @@ import com.gxwebsoft.gxmu.service.ReviewListService;
 import io.swagger.annotations.Api;
 import io.swagger.annotations.ApiOperation;
 import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.*;
 
 import javax.annotation.Resource;
@@ -67,6 +68,7 @@ public class ManuscriptController extends BaseController {
     @ApiOperation("添加稿件")
     @PostMapping()
     public ApiResult<?> save(@RequestBody Manuscript manuscript) {
+        normalizeContentFormat(manuscript);
         // 记录当前登录用户id
         User loginUser = getLoginUser();
         if (loginUser != null) {
@@ -98,6 +100,7 @@ public class ManuscriptController extends BaseController {
     @ApiOperation("修改稿件")
     @PutMapping()
     public ApiResult<?> update(@RequestBody Manuscript manuscript) {
+        normalizeContentFormat(manuscript);
         if (manuscriptService.updateById(manuscript)) {
             return success("修改成功");
         }
@@ -113,6 +116,17 @@ public class ManuscriptController extends BaseController {
         return fail("删除失败");
     }
 
+    /**
+     * 正文格式兜底：客户端没带 contentFormat 时按 html 存，
+     * 避免下游（小程序、后台列表）拿到空值又得靠内容猜格式。
+     * 实际上写库前正文应已统一成 HTML（后台编辑器保存时转换）。
+     */
+    private void normalizeContentFormat(Manuscript manuscript) {
+        if (!StringUtils.hasText(manuscript.getContentFormat())) {
+            manuscript.setContentFormat("html");
+        }
+    }
+
     @ApiOperation("批量添加稿件")
     @PostMapping("/batch")
     public ApiResult<?> saveBatch(@RequestBody List<Manuscript> list) {

src/main/java/com/gxwebsoft/cms/entity/Manuscript.java

@@ -32,6 +32,9 @@ public class Manuscript implements Serializable {
 
     private String content;
 
+    @ApiModelProperty(value = "正文格式：html/markdown/text")
+    private String contentFormat;
+
     private String cover;
 
     @ApiModelProperty(value = "是否删除, 0否, 1是")