feat(admin-web): 引荐关系树支持递归展开每个节点

- 创建 ReferralNodeItem 递归组件
- 每个有下级的节点都显示"+"按钮
- 点击"+"异步加载并展开该节点的下级
- 展开后按钮变为"-"，点击收起
- 加载中显示"..."
- 子节点也支持递归展开，可无限层级

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/admin-web/src/app/(dashboard)/users/[id]/page.tsx

@@ -15,6 +15,7 @@ import {
   useWalletLedger,
   useAuthorizationDetail,
 } from '@/hooks/useUserDetailPage';
+import { userDetailService } from '@/services/userDetailService';
 import type {
   ReferralNode,
   PlantingLedgerItem,
@@ -139,7 +140,8 @@ export default function UserDetailPage() {
   const [treeRootUser, setTreeRootUser] = useState<string>(accountSequence);
   const [plantingPage, setPlantingPage] = useState(1);
   const [walletPage, setWalletPage] = useState(1);
-  const [showDirectReferrals, setShowDirectReferrals] = useState(false); // 默认收起直推下级
+  // 存储已展开节点的状态：key 是节点 accountSequence，value 是其子节点数组（null 表示未加载）
+  const [expandedNodes, setExpandedNodes] = useState<Record<string, ReferralNode[] | null>>({});
 
   // 获取用户完整信息
   const { data: userDetail, isLoading: detailLoading, error: detailError } = useUserFullDetail(accountSequence);
@@ -167,6 +169,37 @@ export default function UserDetailPage() {
     setTreeRootUser(node.accountSequence);
   }, []);
 
+  // 展开/收起节点的下级
+  const handleToggleNode = useCallback(async (nodeSeq: string, hasChildren: boolean) => {
+    if (!hasChildren) return;
+
+    // 如果已展开，则收起
+    if (expandedNodes[nodeSeq] !== undefined) {
+      setExpandedNodes(prev => {
+        const newState = { ...prev };
+        delete newState[nodeSeq];
+        return newState;
+      });
+      return;
+    }
+
+    // 展开：先标记为 null（加载中），然后获取数据
+    setExpandedNodes(prev => ({ ...prev, [nodeSeq]: null }));
+
+    try {
+      const treeData = await userDetailService.getReferralTree(nodeSeq, 'down', 1);
+      setExpandedNodes(prev => ({ ...prev, [nodeSeq]: treeData.directReferrals }));
+    } catch (error) {
+      console.error('获取下级失败:', error);
+      // 加载失败时移除展开状态
+      setExpandedNodes(prev => {
+        const newState = { ...prev };
+        delete newState[nodeSeq];
+        return newState;
+      });
+    }
+  }, [expandedNodes]);
+
   // 返回列表
   const handleBack = useCallback(() => {
     router.push('/users');
@@ -370,72 +403,18 @@ export default function UserDetailPage() {
                     </div>
                   )}
 
-                  {/* 当前用户 */}
-                  <div className={styles.referralTree__current}>
-                    <div
-                      className={cn(
-                        styles.referralTree__node,
-                        styles['referralTree__node--current'],
-                        referralTree.currentUser.accountSequence === accountSequence &&
-                          styles['referralTree__node--highlight']
-                      )}
-                    >
-                      <span className={styles.referralTree__nodeSeq}>
-                        {referralTree.currentUser.accountSequence}
-                      </span>
-                      <span className={styles.referralTree__nodeNickname}>
-                        {referralTree.currentUser.nickname || '未设置'}
-                      </span>
-                      <span className={styles.referralTree__nodeAdoptions}>
-                        本人认种: {formatNumber(referralTree.currentUser.personalAdoptions)}
-                      </span>
-                      <span className={styles.referralTree__nodeCount}>
-                        引荐: {formatNumber(referralTree.currentUser.directReferralCount)}
-                      </span>
-                    </div>
-                    {/* 展开/收起直推下级按钮 */}
-                    {referralTree.directReferrals.length > 0 && (
-                      <button
-                        className={styles.referralTree__toggleButton}
-                        onClick={() => setShowDirectReferrals(!showDirectReferrals)}
-                      >
-                        {showDirectReferrals ? '−' : '+'}
-                      </button>
-                    )}
+                  {/* 当前用户及其递归下级 */}
+                  <div className={styles.referralTree__currentWrapper}>
+                    <ReferralNodeItem
+                      node={referralTree.currentUser}
+                      isCurrentUser={true}
+                      isHighlight={referralTree.currentUser.accountSequence === accountSequence}
+                      expandedNodes={expandedNodes}
+                      onToggle={handleToggleNode}
+                      onClick={handleTreeNodeClick}
+                    />
                   </div>
 
-                  {/* 引荐用户 - 默认收起，点击展开 */}
-                  {referralTree.directReferrals.length > 0 && showDirectReferrals && (
-                    <div className={styles.referralTree__directReferrals}>
-                      <div className={styles.referralTree__connector}>↓</div>
-                      <div className={styles.referralTree__label}>
-                        引荐用户 ({referralTree.directReferrals.length})
-                      </div>
-                      <div className={styles.referralTree__nodeGrid}>
-                        {referralTree.directReferrals.map((referral) => (
-                          <button
-                            key={referral.accountSequence}
-                            className={styles.referralTree__node}
-                            onClick={() => handleTreeNodeClick(referral)}
-                          >
-                            <span className={styles.referralTree__nodeSeq}>{referral.accountSequence}</span>
-                            <span className={styles.referralTree__nodeNickname}>
-                              {referral.nickname || '未设置'}
-                            </span>
-                            <span className={styles.referralTree__nodeAdoptions}>
-                              本人认种: {formatNumber(referral.personalAdoptions)}
-                            </span>
-                            {referral.directReferralCount > 0 && (
-                              <span className={styles.referralTree__nodeCount}>
-                                引荐: {formatNumber(referral.directReferralCount)}
-                              </span>
-                            )}
-                          </button>
-                        ))}
-                      </div>
-                    </div>
-                  )}
-
                   {referralTree.directReferrals.length === 0 && referralTree.ancestors.length === 0 && (
                     <div className={styles.referralTree__empty}>暂无引荐关系</div>
                   )}
@@ -810,3 +789,87 @@ export default function UserDetailPage() {
     </PageContainer>
   );
 }
+
+/**
+ * 递归渲染引荐节点
+ */
+interface ReferralNodeItemProps {
+  node: ReferralNode;
+  isCurrentUser?: boolean;
+  isHighlight?: boolean;
+  expandedNodes: Record<string, ReferralNode[] | null>;
+  onToggle: (nodeSeq: string, hasChildren: boolean) => void;
+  onClick: (node: ReferralNode) => void;
+}
+
+function ReferralNodeItem({
+  node,
+  isCurrentUser = false,
+  isHighlight = false,
+  expandedNodes,
+  onToggle,
+  onClick,
+}: ReferralNodeItemProps) {
+  const hasChildren = node.directReferralCount > 0;
+  const isExpanded = expandedNodes[node.accountSequence] !== undefined;
+  const isLoading = expandedNodes[node.accountSequence] === null;
+  const children = expandedNodes[node.accountSequence] || [];
+
+  return (
+    <div className={styles.referralTree__nodeItem}>
+      <div className={styles.referralTree__nodeContent}>
+        <button
+          className={cn(
+            styles.referralTree__node,
+            isCurrentUser && styles['referralTree__node--current'],
+            isHighlight && styles['referralTree__node--highlight']
+          )}
+          onClick={() => onClick(node)}
+        >
+          <span className={styles.referralTree__nodeSeq}>{node.accountSequence}</span>
+          <span className={styles.referralTree__nodeNickname}>
+            {node.nickname || '未设置'}
+          </span>
+          <span className={styles.referralTree__nodeAdoptions}>
+            本人认种: {formatNumber(node.personalAdoptions)}
+          </span>
+          {node.directReferralCount > 0 && (
+            <span className={styles.referralTree__nodeCount}>
+              引荐: {formatNumber(node.directReferralCount)}
+            </span>
+          )}
+        </button>
+        {/* 展开/收起按钮 */}
+        {hasChildren && (
+          <button
+            className={styles.referralTree__toggleButton}
+            onClick={(e) => {
+              e.stopPropagation();
+              onToggle(node.accountSequence, hasChildren);
+            }}
+            disabled={isLoading}
+          >
+            {isLoading ? '...' : isExpanded ? '−' : '+'}
+          </button>
+        )}
+      </div>
+      {/* 递归渲染子节点 */}
+      {isExpanded && children.length > 0 && (
+        <div className={styles.referralTree__children}>
+          <div className={styles.referralTree__connector}>↓</div>
+          <div className={styles.referralTree__childrenGrid}>
+            {children.map((child) => (
+              <ReferralNodeItem
+                key={child.accountSequence}
+                node={child}
+                expandedNodes={expandedNodes}
+                onToggle={onToggle}
+                onClick={onClick}
+              />
+            ))}
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}

frontend/admin-web/src/app/(dashboard)/users/[id]/user-detail.module.scss

@@ -425,6 +425,40 @@
   font-weight: $font-weight-medium;
 }
 
+// 递归节点组件样式
+.referralTree__currentWrapper {
+  @include flex-column;
+  align-items: center;
+  width: 100%;
+}
+
+.referralTree__nodeItem {
+  @include flex-column;
+  align-items: center;
+}
+
+.referralTree__nodeContent {
+  @include flex-column;
+  align-items: center;
+}
+
+.referralTree__children {
+  @include flex-column;
+  align-items: center;
+  margin-top: $spacing-sm;
+  padding-left: $spacing-xl;
+  border-left: 2px dashed $border-color;
+  width: 100%;
+}
+
+.referralTree__childrenGrid {
+  display: flex;
+  flex-wrap: wrap;
+  gap: $spacing-md;
+  justify-content: center;
+  margin-top: $spacing-sm;
+}
+
 .referralTree__directReferrals {
   @include flex-column;
   align-items: center;