fix: 修复多处边界条件问题

- rooms: parseRoomNumber 未知格式返回默认 capacity=4，防止 undefined 绕过入住容量检查
- rooms: 修复 parseInt() || undefined 导致楼层 0 被吞掉
- rooms: batchImport 中 capacity 使用 ?? 代替 ||，显式 0 不被覆盖
- occupancies: 所有 capacity 比较加 ?? 0 防守兜底，fail closed
- schedules: assertValidScheduleRange 增加 startTime > endTime 校验
- attendance: 时段重叠检查改为按 startTime 排序后再比较，消除漏检
- attendance: 移除 getScheduleOptionsForAttendance 中不可靠的 raw[index] fallback
- expenses: 个人附加费批量导入增加 assertPositiveAmount 校验
- expenses: 水电费导入增加 periodEnd >= periodStart 校验

apps/server/src/rooms/rooms.service.ts

@@ -50,7 +50,8 @@ export class RoomsService {
     if (familyMatch) {
       const bldg = `${familyMatch[1]}-${familyMatch[2]}栋`;
       const roomPart = familyMatch[3];
-      const floor = parseInt(roomPart.charAt(0), 10) || undefined;
+      const rawFloor = parseInt(roomPart.charAt(0), 10);
+      const floor = Number.isNaN(rawFloor) ? undefined : rawFloor;
       return { building: bldg, floor, roomType: '家庭房', capacity: 4 };
     }
     // 标准: X-YZZ 格式
@@ -58,7 +59,8 @@ export class RoomsService {
     if (stdMatch) {
       const bldgNum = stdMatch[1];
       const roomPart = stdMatch[2];
-      const floor = parseInt(roomPart.charAt(0), 10) || undefined;
+      const rawFloor = parseInt(roomPart.charAt(0), 10);
+      const floor = Number.isNaN(rawFloor) ? undefined : rawFloor;
       const building = `${bldgNum}号楼`;
       let roomType = '四人间';
       let capacity = 4;
@@ -71,7 +73,7 @@ export class RoomsService {
       }
       return { building, floor, roomType, capacity };
     }
-    return {};
+    return { capacity: 4, roomType: '四人间' };
   }
 
   async findAll(query?: { building?: string; includeArchived?: boolean }) {
@@ -374,7 +376,7 @@ export class RoomsService {
           roomNumber: row.roomNumber.trim(),
           building: row.building?.trim() || parsed.building || undefined,
           floor: row.floor ?? parsed.floor,
-          capacity: row.capacity || parsed.capacity || 4,
+          capacity: row.capacity ?? parsed.capacity ?? 4,
           roomType: row.roomType || parsed.roomType || undefined,
           rentalCategory: row.rentalCategory || undefined,
           monthlyRate: row.monthlyRate ?? undefined,