feat(contribution-service): 贡献值明细按 L/T 降序排序

- 同伴下贡献值 (TEAM_LEVEL): 按 levelDepth DESC 排序 (L3, L2, L1)
- 同伴上贡献值 (TEAM_BONUS): 按 bonusTier DESC 排序 (T3, T2, T1)
- 全部/本人: 按 levelDepth DESC, bonusTier DESC, createdAt DESC

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

backend/services/contribution-service/src/infrastructure/persistence/repositories/contribution-record.repository.ts

@@ -48,12 +48,22 @@ export class ContributionRecordRepository implements IContributionRecordReposito
     const page = options?.page ?? 1;
     const limit = options?.limit ?? 50;
 
+    // 根据 sourceType 动态排序：同伴下按 L 降序，同伴上按 T 降序，全部按 L/T 降序
+    let orderBy: any;
+    if (options?.sourceType === 'TEAM_LEVEL') {
+      orderBy = [{ levelDepth: 'desc' }, { createdAt: 'desc' }];
+    } else if (options?.sourceType === 'TEAM_BONUS') {
+      orderBy = [{ bonusTier: 'desc' }, { createdAt: 'desc' }];
+    } else {
+      orderBy = [{ levelDepth: 'desc' }, { bonusTier: 'desc' }, { createdAt: 'desc' }];
+    }
+
     const [records, total] = await Promise.all([
       this.client.contributionRecord.findMany({
         where,
         skip: (page - 1) * limit,
         take: limit,
-        orderBy: { createdAt: 'desc' },
+        orderBy,
       }),
       this.client.contributionRecord.count({ where }),
     ]);