feature: a minimal implementation of staff management is done.

backend/src/modules/staff/dto/invite-staff.dto.ts

@@ -0,0 +1,15 @@
+import { IsArray, IsEmail, IsString, MinLength } from 'class-validator';
+
+export class InviteStaffDto {
+  @IsEmail()
+  email: string;
+
+  @IsString()
+  @MinLength(1)
+  name: string;
+
+  /** TAB_* permission names; EDIT implies READ after normalization. */
+  @IsArray()
+  @IsString({ each: true })
+  permissionNames: string[];
+}