feat: enhance role handling by updating reply structure and adding role assignment functionality

src/services/boosterRoleService.ts

@@ -28,6 +28,7 @@ export type RoleRepository = {
   listRoles(): Promise<ExistingRole[]>;
   createRole(input: { name: string; color: string | null; permissions: string[]; position: number }): Promise<{ id: string }>;
   updateRole(roleId: string, input: { name?: string; color?: string | null; icon?: string | null }): Promise<void>;
+  assignRole(userId: string, roleId: string): Promise<void>;
   deleteRole(roleId: string): Promise<void>;
 };
 
@@ -83,6 +84,8 @@ export class BoosterRoleService {
       await this.roles.updateRole(role.id, { icon: input.icon.dataUri });
     }
 
+    await this.roles.assignRole(userId, role.id);
+
     const timestamp = this.now();
     const record = {
       guildId,