feat: integrate Bed/Locker into Occupancy check-in/out flow

apps/server/src/occupancies/dto/occupancy.dto.ts

@@ -25,6 +25,13 @@ export class CheckInDto {
   @IsOptional()
   @IsInt()
   tenantId?: number;
+  @IsOptional()
+  @IsInt()
+  bedId?: number;  // 后续改 required
+
+  @IsOptional()
+  @IsInt()
+  lockerId?: number;
 }
 
 export class CheckOutDto {
@@ -51,6 +58,13 @@ export class TransferRoomDto {
   @IsString()
   oldBillingEndDate?: string; // 旧房计费截止日，默认=transferDate
 
+  @IsOptional()
+  @IsInt()
+  newBedId?: number;
+
+  @IsOptional()
+  @IsInt()
+  newLockerId?: number;
   @IsOptional()
   @IsString()
   newBillingStartDate?: string; // 新房计费起始日，默认=transferDate次日