feat(flow): 接入新流程体系——SDK withdraw/progress/diagramUrl：撤回后端中转+同源流程图端点+Trace 结构化 steps（治前端直调外溢）

src/main/java/com/yunhai/notice/controller/api/NoticeFlowController.java

@@ -66,6 +66,21 @@ public class NoticeFlowController {
         return noticeFlowService.buildTrace(serid, user);
     }
 
+    /**
+     * 撤回审核（2026-09-17 治理：原先前端直调 flow-center 用户面，现后端经 SDK 托管件中转；
+     * 仅创建人本人 + 审批中，撤回后状态由 flow.withdrawn 回调推进）。
+     */
+    @PostMapping("Withdraw")
+    public void withdraw(@RequestParam("serid") Integer serid, BoaUser user) {
+        noticeFlowService.withdrawNotice(serid, user);
+    }
+
+    /** 流程示意图（PNG 流，同源直嵌 img；可见性与 Trace 同口径，token 不落前端） */
+    @GetMapping(value = "Diagram", produces = org.springframework.http.MediaType.IMAGE_PNG_VALUE)
+    public byte[] diagram(@RequestParam("serid") Integer serid, BoaUser user) {
+        return noticeFlowService.diagramImage(serid, user);
+    }
+
     private Integer currentSchId(BoaUser user) {
         if (user == null || user.getCurrentRole() == null) {
             return null;

src/main/java/com/yunhai/notice/model/flow/FlowModels.java

@@ -7,6 +7,8 @@ import com.yunhai.platform.openapi.flow.model.FlowApplyResult;
 import com.yunhai.platform.openapi.flow.model.FlowInstance;
 import com.yunhai.platform.openapi.flow.model.FlowCallbackRegBody;
 import com.yunhai.platform.openapi.flow.model.FlowCallbackRegResult;
+import com.yunhai.platform.openapi.flow.model.FlowDiagramUrl;
+import com.yunhai.platform.openapi.flow.model.FlowProgress;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 
@@ -61,4 +63,18 @@ public final class FlowModels {
     @JsonIgnoreProperties(ignoreUnknown = true)
     public static class CallbackRegResultVo extends FlowCallbackRegResult {
     }
+
+    /** 办件进度（GET /oapi/flow/progress；steps[0] 固定"发起申请"，2026-09-17 接入） */
+    @Data
+    @EqualsAndHashCode(callSuper = true)
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    public static class ProgressVo extends FlowProgress {
+    }
+
+    /** 流程示意图换图地址（GET /oapi/flow/diagram/url；imgUrl 为 flow-center 免签相对路径） */
+    @Data
+    @EqualsAndHashCode(callSuper = true)
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    public static class DiagramUrlVo extends FlowDiagramUrl {
+    }
 }

src/main/java/com/yunhai/notice/service/flow/FlowCenterClient.java

@@ -116,6 +116,87 @@ public class FlowCenterClient implements FlowClient {
                 FlowModels.CallbackRegResultVo.class);
     }
 
+    @Override
+    public void withdraw(Integer schId, Long instanceId, Integer submitterId) {
+        requireEnabled();
+        if (directoryResolved) {
+            com.yunhai.platform.openapi.flow.YschFlowOpenApi.withdraw(schId, instanceId, submitterId);
+            return;
+        }
+        Map<String, String> query = new HashMap<>();
+        query.put("schId", String.valueOf(schId));
+        query.put("submitterId", String.valueOf(submitterId));
+        // 无请求体：对端 POST 无 @RequestBody，query 传参即可（body 传 null 即零长度请求体）
+        openCall.post(target(), "/oapi/flow/instance/" + instanceId + "/withdraw", query, null, Void.class);
+    }
+
+    @Override
+    public FlowModels.ProgressVo progress(Integer schId, Long instanceId) {
+        requireEnabled();
+        if (directoryResolved) {
+            return com.yunhai.platform.openapi.flow.YschFlowOpenApi.progress(
+                    instanceId, BIZ_TYPE, null, schId, FlowModels.ProgressVo.class);
+        }
+        Map<String, String> query = new HashMap<>();
+        query.put("instanceId", String.valueOf(instanceId));
+        query.put("schId", String.valueOf(schId));
+        return openCall.get(target(), "/oapi/flow/progress", query, FlowModels.ProgressVo.class);
+    }
+
+    /** 免签出图端点（flow-center OpenDiagramImageController，相对其 context-path） */
+    private static final String DIAGRAM_IMG_PATH = "/open/flow/diagram/img";
+
+    @Override
+    public byte[] diagramImage(Integer schId, Long instanceId) {
+        requireEnabled();
+        String imgUrl;
+        if (directoryResolved) {
+            FlowModels.DiagramUrlVo dto = com.yunhai.platform.openapi.flow.YschFlowOpenApi.diagramUrl(
+                    instanceId, null, null, schId, FlowModels.DiagramUrlVo.class);
+            imgUrl = dto == null ? null : dto.getImgUrl();
+        } else {
+            Map<String, String> query = new HashMap<>();
+            query.put("instanceId", String.valueOf(instanceId));
+            query.put("schId", String.valueOf(schId));
+            FlowModels.DiagramUrlVo dto =
+                    openCall.get(target(), "/oapi/flow/diagram/url", query, FlowModels.DiagramUrlVo.class);
+            imgUrl = dto == null ? null : dto.getImgUrl();
+        }
+        String token = tokenOf(imgUrl);
+        if (token == null) {
+            throw new BizException(ErrorCode.PARAM_ERROR, "流程中心未返回有效的示意图地址");
+        }
+        Map<String, String> imgQuery = new HashMap<>();
+        imgQuery.put("token", token);
+        byte[] bytes = directoryResolved
+                ? com.yunhai.platform.openapi.flow.YschFlowOpenApi.raw().download(DIAGRAM_IMG_PATH, imgQuery)
+                : openCall.download(target(), DIAGRAM_IMG_PATH, imgQuery);
+        if (bytes == null || bytes.length == 0) {
+            throw new BizException(ErrorCode.PARAM_ERROR, "流程示意图为空（流程可能未发布节点）");
+        }
+        return bytes;
+    }
+
+    /**
+     * 从换图地址中取 token（形如 {@code /open/flow/diagram/img?token=xxx}）。
+     * 包可见：契约测试冻结"token 只在后端流转、前端拿不到"的取用形态。
+     */
+    static String tokenOf(String imgUrl) {
+        if (imgUrl == null || imgUrl.isEmpty()) {
+            return null;
+        }
+        int q = imgUrl.indexOf("?token=");
+        if (q < 0) {
+            return null;
+        }
+        String token = imgUrl.substring(q + "?token=".length());
+        int amp = token.indexOf('&');
+        if (amp >= 0) {
+            token = token.substring(0, amp);
+        }
+        return token.isEmpty() ? null : token;
+    }
+
     private TargetSpec target() {
         // base-path 空：本地/容器裸地址直连（两级模型 §2.2 对齐不变式的现行约定）
         return TargetSpec.of(properties.getBaseUrl(), "");

src/main/java/com/yunhai/notice/service/flow/FlowClient.java

@@ -21,4 +21,16 @@ public interface FlowClient {
 
     /** 回调注册（下发 secret；重复注册会轮换 secret——仅在 reg 缺失时调用） */
     FlowModels.CallbackRegResultVo registerCallback(Integer schId, FlowModels.CallbackRegBody body);
+
+    /**
+     * 撤回（托管件，2026-09-17 接入）：对端按 submitterId 与办件提交人逐字复核，
+     * 应用签名只证明"哪个应用在调"不证明"谁在撤"——防业务应用越权代撤他人办件。
+     */
+    void withdraw(Integer schId, Long instanceId, Integer submitterId);
+
+    /** 办件进度（结构化 steps，instanceId 定位；oapi 只校验 schId，调用方先做可见性守卫） */
+    FlowModels.ProgressVo progress(Integer schId, Long instanceId);
+
+    /** 流程示意图字节（token 换图两步都在本方法内，浏览器只拿同源 PNG，token 不落前端） */
+    byte[] diagramImage(Integer schId, Long instanceId);
 }

src/main/java/com/yunhai/notice/service/flow/NoticeFlowService.java

@@ -235,6 +235,15 @@ public class NoticeFlowService {
                     result.put("finishTime", instance.getFinishTime());
                     result.put("trace", parseJson(instance.getTraceJson()));
                 }
+                if (notice.getFlowInstanceId() != null) {
+                    // 结构化步骤（steps[0] 固定"发起申请"，同节点多任务每人一行）——
+                    // 2026-09-17 接入 SDK progress，详情页时间线数据源；失败降级不阻断
+                    FlowModels.ProgressVo progress =
+                            flowClient.progress(notice.getSchId(), notice.getFlowInstanceId());
+                    if (progress != null) {
+                        result.put("steps", progress.getSteps());
+                    }
+                }
             } catch (Exception e) {
                 // 进度查询失败不阻断详情：展示本地镜像态即可（流程中心停机时详情仍可用）
                 log.warn("[notice-flow] 进度查询失败：notice={} {}", noticeId, e.toString());
@@ -243,6 +252,48 @@ public class NoticeFlowService {
         return result;
     }
 
+    /**
+     * 撤回审核（2026-09-17 治理：原先前端直调 flow-center 用户面——跨应用 CAS 票据 + CORS
+     * 双重外溢，且"谁能撤"落在前端）。现经 SDK 托管件后端中转：①本人（publisherAccount）
+     * = 权威授权；②审批中(10) 且已有实例；③对端再按 submitterId 复核一次。
+     * 撤回后镜像状态由 flow.withdrawn 回调推进（40），本方法不改本地状态——单一写入口。
+     */
+    public void withdrawNotice(Integer noticeId, BoaUser user) {
+        Notice notice = requireNotice(noticeId);
+        if (user == null || !StringUtils.hasText(notice.getPublisherAccount())
+                || !notice.getPublisherAccount().equals(user.getAccount())) {
+            throw new BizException(ErrorCode.FORBIDDEN, "仅通知创建人可撤回审核");
+        }
+        Integer audit = notice.getAuditStatus();
+        if (audit == null || audit != FlowAuditStatusEnum.APPROVING.getCode()) {
+            throw new BizException(ErrorCode.PARAM_ERROR, "仅审批中的通知可撤回");
+        }
+        if (notice.getFlowInstanceId() == null) {
+            throw new BizException(ErrorCode.PARAM_ERROR, "该通知尚未进入流程，无需撤回");
+        }
+        flowClient.withdraw(notice.getSchId(), notice.getFlowInstanceId(), user.getId());
+        log.info("[notice-flow] 撤回审核：notice={} instance={} user={}",
+                noticeId, notice.getFlowInstanceId(), user.getId());
+    }
+
+    /**
+     * 流程示意图（PNG 流，同源直嵌 {@code <img>}）：可见性与 Trace 同口径（未发布仅三类人）。
+     * token 与字节都在服务端流转，前端不再需要知道 flow-center 地址。
+     */
+    public byte[] diagramImage(Integer noticeId, BoaUser user) {
+        Notice notice = requireNotice(noticeId);
+        if (notice.getStatus() == null || notice.getStatus() != 1) {
+            noticeFlowGuard.requireUnpublishedVisible(notice, user);
+        }
+        if (!StringUtils.hasText(notice.getFlowGuid()) || notice.getAuditStatus() == null) {
+            throw new BizException(ErrorCode.PARAM_ERROR, "该通知未接入审核流程");
+        }
+        if (notice.getFlowInstanceId() == null) {
+            throw new BizException(ErrorCode.PARAM_ERROR, "该通知尚未进入流程，无流程图");
+        }
+        return flowClient.diagramImage(notice.getSchId(), notice.getFlowInstanceId());
+    }
+
     /** 编辑页"审核流程"选择器数据源（未启用返回空列表由前端隐藏） */
     public List<FlowModels.FlowSummaryVo> options(Integer schId) {
         if (!properties.isEnabled()) {