add contract hazard declaration, DO collection dates, and booking request currency migrations; implement article body diff component and integrate into contract revision timeline

apps/edr-freight-api/src/modules/contracts/dto/accept-contract.dto.ts

@@ -1,6 +1,13 @@
 import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
 import { Type } from 'class-transformer';
-import { IsInt, IsOptional, Max, Min, ValidateNested } from 'class-validator';
+import {
+  IsDateString,
+  IsInt,
+  IsOptional,
+  Max,
+  Min,
+  ValidateNested,
+} from 'class-validator';
 
 import { UpdateContractDocumentDto } from './contract-document.dto';
 
@@ -18,6 +25,21 @@ export class AcceptContractDto {
   @Max(3650)
   validityDays!: number;
 
+  /**
+   * Explicit validity window picked by staff in the accept dialog. When both are
+   * present they win over `validityDays` (which is then only the derived span)
+   * and the configured-period check is skipped — staff may enter any range.
+   */
+  @ApiPropertyOptional({ description: 'Validity start (ISO date)' })
+  @IsOptional()
+  @IsDateString()
+  validFrom?: string;
+
+  @ApiPropertyOptional({ description: 'Validity end (ISO date)' })
+  @IsOptional()
+  @IsDateString()
+  validUntil?: string;
+
   /**
    * Optional per-contract document override edited by staff in the accept
    * dialog. When present its articles are frozen onto THIS contract; when