refactor: domain repositories (#4403)

server/src/domain/repositories/system-config.repository.ts

@@ -0,0 +1,10 @@
+import { SystemConfigEntity } from '@app/infra/entities';
+
+export const ISystemConfigRepository = 'ISystemConfigRepository';
+
+export interface ISystemConfigRepository {
+  load(): Promise<SystemConfigEntity[]>;
+  readFile(filename: string): Promise<Buffer>;
+  saveAll(items: SystemConfigEntity[]): Promise<SystemConfigEntity[]>;
+  deleteKeys(keys: string[]): Promise<void>;
+}