refactor: introduce bindThis decorator to bind this automaticaly

packages/backend/src/core/ProxyAccountService.ts

@@ -3,6 +3,7 @@ import type { UsersRepository } from '@/models/index.js';
 import type { ILocalUser, User } from '@/models/entities/User.js';
 import { DI } from '@/di-symbols.js';
 import { MetaService } from '@/core/MetaService.js';
+import { bindThis } from '@/decorators.js';
 
 @Injectable()
 export class ProxyAccountService {
@@ -14,6 +15,7 @@ export class ProxyAccountService {
 	) {
 	}
 
+	@bindThis
 	public async fetch(): Promise<ILocalUser | null> {
 		const meta = await this.metaService.fetch();
 		if (meta.proxyAccountId == null) return null;