docs(be): add JSDoc into NotificationService with Refactoring

[nhjbest22]

Description

NotificationService의 함수들의 역할을 명확히하기 위해 JSDoc을 추가했습니다.

Additional context

추가적인 리팩토링을 진행하였습니다.

codedang/apps/backend/apps/admin/src/notification/notification.service.ts

Lines 196 to 212 in 705aa73

	const notification = await this.prisma.notification.create({
	data: {
	title,
	message,
	url,
	type
	}
	})
	const notificationRecords = userIds.map((userId) => ({
	notificationId: notification.id,
	userId
	}))
	await this.prisma.notificationRecord.createMany({
	data: notificationRecords
	})

기존에는 위 코드와 같이 notification 엔티티를 생성한 후 notificationRecord 엔티티를 별도로 생성하도록 되어 있었습니다.
2번의 쿼리 호출이 비효율적인 것 같아 다음과 같이 1번의 쿼리 호출로 모든 엔티티가 생성되도록 변경하였습니다.

codedang/apps/backend/apps/admin/src/notification/notification.service.ts

Lines 246 to 258 in bc5d83e

	await this.prisma.notification.create({
	data: {
	title,
	message,
	url,
	type,
	NotificationRecord: {
	createMany: {
	data: userIds.map((userId) => ({ userId }))
	}
	}
	}
	})

---

Closes TAS-2446

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines
• Read the Contributing Guidelines and follow the Commit Convention
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

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[notion-task-integration]

Admin Notification JSDoc 추가

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