feat(eims): implement POST /v1/bulkCancel

New endpoint: POST invoices/eims/bulk-cancel, body { items: [{invoiceId,
reasonCode, remark?}] }. Same eimsCancel permission as single cancel — a
batch-scale version of the same irreversible-at-MoR action, not a new
capability.

Same local-eligibility doctrine as single cancel: an already-cancelled or
never-registered invoice is refused right here, no HTTP call, before it
gets a seat in the batch. Only genuinely eligible invoices go into the one
/v1/bulkCancel request; every outcome (local refusal or MoR's own
per-IRN result) is reported back independently — one invoice failing
never blocks the rest.

MoR's bulk response mixes success and error shapes in the same array,
disambiguated by Status (capital, error) vs status (lowercase, success)
— matched back to our invoices by IRN. Notably the bulk success shape
carries no cancellationDate at all, unlike single cancel.

Left out of this pass: bulkRegister. It's async (returns only a
conversationId immediately, results arrive via a webhook callback we
don't have yet) and needs manual counter/previousIrn management per
the collection's own docs — a materially different reservation model
than today's single-invoice TX1/TX2 pattern. Scoping that is a
separate, bigger piece of work.

apps/edr-freight-api/src/modules/eims/dto/bulk-cancel-eims-registration.dto.ts

@@ -0,0 +1,33 @@
+import { ApiProperty, ApiPropertyOptional } from "@nestjs/swagger";
+import { Type } from "class-transformer";
+import { ArrayMinSize, IsArray, IsOptional, IsString, IsUUID, Length, ValidateNested } from "class-validator";
+
+export class BulkCancelEimsItemDto {
+  @ApiProperty({ description: "Invoice ID to cancel." })
+  @IsUUID()
+  invoiceId!: string;
+
+  @ApiProperty({
+    description: 'Numeric reason code, e.g. "1" (Duplicate), "6" (Calculation Error).',
+    example: "1",
+  })
+  @IsString()
+  @Length(1, 8)
+  reasonCode!: string;
+
+  @ApiPropertyOptional({ description: "Free-text cancellation note.", example: "Duplicate submission" })
+  @IsOptional()
+  @IsString()
+  @Length(0, 500)
+  remark?: string;
+}
+
+/** `POST invoices/eims/bulk-cancel` body — see `EimsCancellationService.cancelBulkWithEims`. */
+export class BulkCancelEimsRegistrationDto {
+  @ApiProperty({ type: [BulkCancelEimsItemDto] })
+  @IsArray()
+  @ArrayMinSize(1)
+  @ValidateNested({ each: true })
+  @Type(() => BulkCancelEimsItemDto)
+  items!: BulkCancelEimsItemDto[];
+}