trains, wagons,containers and cargoes schema and API

apps/edr-freight-api/src/modules/wagons/dto/assign-wagon-to-train.dto.ts

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+import { IsUUID, IsOptional, IsInt, Min } from 'class-validator';
+
+export class AssignWagonToTrainDto {
+  @IsUUID()
+  trainId!: string;
+
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  sequenceNumber?: number;
+}

apps/edr-freight-api/src/modules/wagons/dto/create-wagon.dto.ts

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+import { IsString, IsUUID, IsOptional, IsInt, Min, IsNumber, IsIn } from 'class-validator';
+
+export class CreateWagonDto {
+  @IsString()
+  wagonNumber!: string;
+
+  @IsUUID()
+  wagonTypeId!: string;
+
+  @IsOptional()
+  @IsUUID()
+  trainId?: string;
+
+  @IsOptional()
+  @IsInt()
+  @Min(1)
+  sequenceNumber?: number;
+
+  @IsNumber()
+  @Min(0)
+  tareWeight!: number;
+
+  @IsNumber()
+  @Min(0)
+  maxPayloadWeight!: number;
+
+  @IsOptional()
+  @IsIn(['AVAILABLE', 'ASSIGNED', 'MAINTENANCE', 'RETIRED'])
+  status?: string;
+
+  @IsOptional()
+  @IsString()
+  notes?: string;
+}

apps/edr-freight-api/src/modules/wagons/dto/reorder-wagons.dto.ts

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+import { IsArray, IsUUID } from 'class-validator';
+
+export class ReorderWagonsDto {
+  @IsArray()
+  @IsUUID(4, { each: true })
+  wagonIds!: string[];
+}

apps/edr-freight-api/src/modules/wagons/dto/update-wagon.dto.ts

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+import { PartialType } from '@nestjs/swagger';
+import { CreateWagonDto } from './create-wagon.dto';
+
+export class UpdateWagonDto extends PartialType(CreateWagonDto) {}