なんかもうめっちゃ変えた

packages/backend/src/server/api/endpoints/email-address/available.ts

@@ -1,5 +1,6 @@
-import define from '../../define.js';
-import { validateEmailForAccount } from '@/services/validate-email-for-account.js';
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { EmailService } from '@/core/EmailService.js';
 
 export const meta = {
 	tags: ['users'],
@@ -31,6 +32,13 @@ export const paramDef = {
 } as const;
 
 // eslint-disable-next-line import/no-default-export
-export default define(meta, paramDef, async (ps) => {
-	return await validateEmailForAccount(ps.emailAddress);
-});
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> {
+	constructor(
+		private emailService: EmailService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			return await this.emailService.validateEmailForAccount(ps.emailAddress);
+		});
+	}
+}