fix: 仪表盘 totalCapacity 聚合值转为数字

apps/server/src/dashboard/dashboard.service.ts

@@ -101,7 +101,8 @@ export class DashboardService {
       .select('SUM(r.capacity)', 'total')
       .where('r.status != :archived', { archived: 'archived' });
     const totalCapacity = await capQb.getRawOne();
-    const cap = totalCapacity?.total || 0;
+    // MySQL 的 SUM() 聚合默认以字符串返回，需显式转成 number
+    const cap = Number(totalCapacity?.total ?? 0) || 0;
     const occupancyRate = cap > 0 ? ((occupiedBeds / cap) * 100).toFixed(1) : 0;
 
     const billStatsQb = this.billRepo