feat: add getDeptDepthMap BFS method for org tree depth tracking

apps/server/src/integration/dingtalk.service.ts

@@ -262,6 +262,42 @@ export class DingTalkService {
     return ids;
   }
 
+  /**
+   * BFS from rootDeptId=1, returns depth of every department.
+   * Depth is 1-based (root=1). Uses listsubid API only, no detail fetches.
+   */
+  private async getDeptDepthMap(token: string): Promise<Map<number, number>> {
+    const depthMap = new Map<number, number>();
+    const queue: Array<{ id: number; depth: number }> = [{ id: 1, depth: 1 }];
+
+    while (queue.length > 0) {
+      const { id, depth } = queue.shift()!;
+      depthMap.set(id, depth);
+
+      try {
+        await this.rateLimit();
+        const res = await fetch(
+          `https://oapi.dingtalk.com/topapi/v2/department/listsubid?access_token=${token}`,
+          {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ dept_id: id }),
+          },
+        );
+        const body: SubDeptIdListResponse = await res.json();
+        if (body.errcode === 0 && body.result?.dept_id_list) {
+          for (const childId of body.result.dept_id_list) {
+            queue.push({ id: childId, depth: depth + 1 });
+          }
+        }
+      } catch (e) {
+        this.logger.error(`getDeptDepthMap 获取部门 ${id} 子部门失败: ${(e as Error).message}`);
+      }
+    }
+
+    return depthMap;
+  }
+
   // ═══════════════════════════════════════════
   // Department detail
   // ═══════════════════════════════════════════
@@ -492,6 +528,7 @@ export class DingTalkService {
 
       // 拉该部门下的用户
       const dingUsers = await this.getDeptUsers(token, deptIds[i]);
+      this.logger.log(`[dingtalk] dept ${deptIds[i]} (${detail.name}): ${dingUsers.length} users`);
 
       nodes.push({
         id: detail.dept_id,