feat(engine): NOTIFY 抄送 + CONDITION 条件路由 + JOIN scope 修复（两批全栈）

- NOTIFY：TYPE_NOTIFY 瞬时抄送（flw_cc 逐人留痕 + CC_SENT 事件 + 站内通知不加待办角标）、/api/flow/cc/my、轨迹 kind=CC 与 oapi progress 抄送步、示意图青框卡片
- CONDITION：flw_router 判断服务注册 + flw_route_log 决策留痕（REQUIRES_NEW，reroute 回滚不丢失败行）+ 同步判断调用（服务目录寻址 + 平台签名，3s×3 退避重试）+ 失败挂起/管理端重跑（不配默认出口）+ 可选事件 flow.route.decided
- JOIN scope：branch_key 路径前缀编码 + scope 级到齐放行 + DefValidator SPLIT/JOIN 配对与键长守卫（存量无点号键零迁移，历史直连图回退实例级口径）
- 管理端：/api/flow/admin/router/* CRUD + POST /api/flow/admin/instance/{id}/reroute
- 生产 SQL：sql/20260923_create_flw_cc.sql（含 flw_task 时间列升 DATETIME(3)）、20260924_create_flw_router_and_route_log.sql
- 测试：全量 125 绿（FlowEngineIT 24，含条件/嵌套并行/退回重走用例）

src/main/java/com/yunhai/flowcenter/notify/UserMsgNotifier.java

@@ -47,6 +47,9 @@ public class UserMsgNotifier {
             case TRANSFERRED:
                 notifyTaskCreated(event);
                 break;
+            case CC_SENT:
+                notifyCc(event);
+                break;
             case COMPLETED:
             case REJECTED:
             case WITHDRAWN:
@@ -121,6 +124,32 @@ public class UserMsgNotifier {
                 "returned:" + instance.getId() + ":" + instance.getVersion(), 30);
     }
 
+    /**
+     * 抄送（2026-09-23 NOTIFY 节点）：msgType=1 通知类（待办才是 2），bizType=flow.cc、
+     * msgNo=cc:{ccId}（逐人逐节点一行一消息，重走重复抄送不互吞）；跳转与任务到达同策略
+     * （bizUrl 优先，空回落办件详情）。★ 不调 todoInc——知会不占待办角标、不进待办列表。
+     */
+    private void notifyCc(FlowEvent event) {
+        FlwInstance instance = instanceOf(event.getInstanceId());
+        Object ccUserId = event.getData() == null ? null : event.getData().get("ccUserId");
+        if (instance == null || ccUserId == null) {
+            return;
+        }
+        Object nodeName = event.getData().get("nodeName");
+        Object ccId = event.getData().get("ccId");
+        String bizTitle = safe(instance.getBizTitle());
+        String content = "「" + bizTitle + "」抄送给您"
+                + (nodeName == null || String.valueOf(nodeName).isEmpty()
+                        ? "" : "（" + nodeName + "）");
+        String jumpPath = instance.getBizUrl() == null || instance.getBizUrl().trim().isEmpty()
+                ? "/instance/" + instance.getId() : instance.getBizUrl();
+        userMsgClient.sendUserMsg(instance.getSchId().intValue(),
+                Collections.singletonList((Integer) ccUserId), 1,
+                "flow.cc", String.valueOf(instance.getId()),
+                "您有新的抄送：" + bizTitle, content,
+                jumpPath, "cc:" + ccId, 30);
+    }
+
     private void notifyResult(FlowEvent event) {
         FlwInstance instance = instanceOf(event.getInstanceId());
         if (instance == null) {