fix(admin-web): add null checks to prevent crash in system account report tabs

面对面结算和过期收益Tab在数据为空时会崩溃，添加空值检查修复此问题。

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

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

frontend/admin-web/src/components/features/system-account-report/SystemAccountsTab.tsx

@@ -299,9 +299,18 @@ function RegionAccountsSection({ data, type }: { data: RegionAccountsSummary; ty
 
 /**
  * 面对面结算统计区域
- * [2026-01-05] 更新：USDT改为绿积分
+ * [2026-01-05] 更新：USDT改为绿积分，添加空值检查
  */
-function OfflineSettlementSection({ data }: { data: SystemAccountReportResponse['offlineSettlement'] }) {
+function OfflineSettlementSection({ data }: { data: SystemAccountReportResponse['offlineSettlement'] | null | undefined }) {
+  if (!data) {
+    return (
+      <div className={styles.section}>
+        <h3 className={styles.sectionTitle}>面对面结算统计</h3>
+        <div className={styles.emptyTable}>暂无面对面结算数据</div>
+      </div>
+    );
+  }
+
   return (
     <div className={styles.section}>
       <h3 className={styles.sectionTitle}>面对面结算统计</h3>
@@ -310,7 +319,7 @@ function OfflineSettlementSection({ data }: { data: SystemAccountReportResponse[
       <div className={styles.summaryCards}>
         <div className={styles.summaryCard}>
           <span className={styles.summaryLabel}>总笔数</span>
-          <span className={styles.summaryValue}>{data.totalCount}</span>
+          <span className={styles.summaryValue}>{data.totalCount ?? 0}</span>
         </div>
         <div className={styles.summaryCard}>
           <span className={styles.summaryLabel}>总金额</span>
@@ -319,7 +328,7 @@ function OfflineSettlementSection({ data }: { data: SystemAccountReportResponse[
       </div>
 
       {/* 按月统计 */}
-      {data.byMonth.length > 0 && (
+      {data.byMonth && data.byMonth.length > 0 && (
         <>
           <h4 className={styles.subTitle}>按月统计</h4>
           <div className={styles.tableWrapper}>
@@ -345,7 +354,7 @@ function OfflineSettlementSection({ data }: { data: SystemAccountReportResponse[
         </>
       )}
 
-      {data.byMonth.length === 0 && (
+      {(!data.byMonth || data.byMonth.length === 0) && (
         <div className={styles.emptyTable}>暂无面对面结算数据</div>
       )}
     </div>
@@ -354,9 +363,18 @@ function OfflineSettlementSection({ data }: { data: SystemAccountReportResponse[
 
 /**
  * 过期收益统计区域
- * [2026-01-05] 更新：USDT改为绿积分
+ * [2026-01-05] 更新：USDT改为绿积分，添加空值检查
  */
-function ExpiredRewardsSection({ data }: { data: SystemAccountReportResponse['expiredRewards'] }) {
+function ExpiredRewardsSection({ data }: { data: SystemAccountReportResponse['expiredRewards'] | null | undefined }) {
+  if (!data) {
+    return (
+      <div className={styles.section}>
+        <h3 className={styles.sectionTitle}>过期收益统计</h3>
+        <div className={styles.emptyTable}>暂无过期收益数据</div>
+      </div>
+    );
+  }
+
   return (
     <div className={styles.section}>
       <h3 className={styles.sectionTitle}>过期收益统计</h3>
@@ -365,7 +383,7 @@ function ExpiredRewardsSection({ data }: { data: SystemAccountReportResponse['ex
       <div className={styles.summaryCards}>
         <div className={styles.summaryCard}>
           <span className={styles.summaryLabel}>总笔数</span>
-          <span className={styles.summaryValue}>{data.totalCount}</span>
+          <span className={styles.summaryValue}>{data.totalCount ?? 0}</span>
         </div>
         <div className={styles.summaryCard}>
           <span className={styles.summaryLabel}>总金额</span>
@@ -374,7 +392,7 @@ function ExpiredRewardsSection({ data }: { data: SystemAccountReportResponse['ex
       </div>
 
       {/* 按权益类型统计 */}
-      {data.byRightType.length > 0 && (
+      {data.byRightType && data.byRightType.length > 0 && (
         <>
           <h4 className={styles.subTitle}>按权益类型统计</h4>
           <div className={styles.tableWrapper}>
@@ -401,7 +419,7 @@ function ExpiredRewardsSection({ data }: { data: SystemAccountReportResponse['ex
       )}
 
       {/* 按月统计 */}
-      {data.byMonth.length > 0 && (
+      {data.byMonth && data.byMonth.length > 0 && (
         <>
           <h4 className={styles.subTitle}>按月统计</h4>
           <div className={styles.tableWrapper}>
@@ -427,7 +445,7 @@ function ExpiredRewardsSection({ data }: { data: SystemAccountReportResponse['ex
         </>
       )}
 
-      {data.byRightType.length === 0 && data.byMonth.length === 0 && (
+      {(!data.byRightType || data.byRightType.length === 0) && (!data.byMonth || data.byMonth.length === 0) && (
         <div className={styles.emptyTable}>暂无过期收益数据</div>
       )}
     </div>