feat: add hazardous goods declaration feature

- Introduced HazardDeclarationPanel component to display dangerous goods declaration details.
- Updated URL constants to include CLEARANCE_PROCEED endpoint for re-requesting operations.
- Enhanced permissions to include hazardous approval roles for contract approvals.
- Integrated HazardDeclarationPanel into ContractRequestDetailPage and ContractClearanceDetailPage.
- Added proceedToOperation method in bookings service for handling operation re-requests.
- Updated contract forms and schemas to include hazard class and UN number fields.
- Implemented validation for hazardous contracts in the contract creation flow.
- Added expiry notice functionality for contracts nearing validity end.
- Created tests for expiry notice calculations and labels.
- Updated UI components to reflect hazardous cargo information and validation errors.

apps/edr-freight-api/src/modules/contracts/entities/contract.entity.ts

@@ -188,6 +188,14 @@ export class Contract extends BaseEntity {
   @Column({ name: 'is_hazardous', type: 'boolean', default: false })
   isHazardous!: boolean;
 
+  /** UN/ADR dangerous-goods class (CLASS_1..CLASS_9); null unless hazardous. */
+  @Column({ name: 'hazard_class', type: 'varchar', length: 16, nullable: true })
+  hazardClass?: string | null;
+
+  /** UN number of the dangerous good; null unless hazardous. */
+  @Column({ name: 'un_number', type: 'varchar', length: 16, nullable: true })
+  unNumber?: string | null;
+
   @Column({ name: 'is_reefer', type: 'boolean', default: false })
   isReefer!: boolean;