fix: make the reference generate on apporaval

apps/edr-freight-api/src/modules/companies/entities/company-profile.entity.ts

@@ -40,14 +40,19 @@ export class CompanyProfile extends BaseEntity {
   @Column({ name: "type", type: "varchar", length: 32, enum: ProfileType })
   type!: ProfileType;
 
+  /**
+   * Official profile reference (e.g. "EX-00001"). Minted only when the profile
+   * is approved (status → Active); pending/unapproved profiles carry NULL.
+   * The unique index tolerates this because Postgres treats NULLs as distinct.
+   * API responses surface it as "" when absent — see ResponseCompanyProfileDto.
+   */
   @Column({
     name: "reference",
     type: "varchar",
     length: 20,
-    nullable: false,
-    unique: true,
+    nullable: true,
   })
-  reference!: string;
+  reference!: string | null;
 
   @Column({
     name: "status",