feat: implement consolidation approval process for shared-wagon bookings

- Add migration for consolidation approvals table and status enum
- Create ConsolidationApprovalService to handle approval logic
- Implement repository for managing consolidation approvals
- Add entity for consolidation approval with necessary fields
- Develop frontend components for displaying and managing consolidation approvals
- Create tests for consolidation approval service to ensure correct behavior

apps/edr-freight-api/src/modules/bookings/dto/request-changes.dto.ts

@@ -158,3 +158,26 @@ export class PairedDecisionDto {
   @Min(1)
   validityDays?: number;
 }
+
+/** Approve a shared-wagon pairing. The note is optional context for the audit. */
+export class ApproveConsolidationDto {
+  @ApiPropertyOptional({
+    description: "Optional note recorded with the approval.",
+    maxLength: 500,
+  })
+  @IsOptional()
+  @IsString()
+  note?: string;
+}
+
+/** Reject a shared-wagon pairing. A reason is mandatory — GL has to act on it. */
+export class RejectConsolidationDto {
+  @ApiProperty({
+    description:
+      "Why the pairing is rejected. Sent back to GL on both bookings.",
+    maxLength: 500,
+  })
+  @IsString()
+  @MinLength(1)
+  reason!: string;
+}