Fix advertisement API code style to match project conventions

[Copilot]

Advertisement API files were using inconsistent formatting (mixed tabs/spaces, missing comment spacing) that deviated from project conventions.

Changes

• Indentation: Standardized to tabs across all advertisement files (controller, service, converter)
• Comment formatting: Added space after // in service method comment
• Method signature: Collapsed unnecessary line breaks in controller endpoint

- public DataResponse<List<AdvertisementResponse>> getHomeAdvertisements(
- ) {
+ public DataResponse<List<AdvertisementResponse>> getHomeAdvertisements() {

-     //메인 홈 화면 할인 광고 목록 조회 (Mock Data)
+	// 메인 홈 화면 할인 광고 목록 조회 (Mock Data)

All changes are whitespace-only; no logic modified.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[fix] 광고 API 코드 스타일 프로젝트 컨벤션에 맞게 통일</issue_title>
<issue_description>## 📌 Description

[fix] 광고 API 코드 스타일 프로젝트 컨벤션에 맞게 통일

✅ To-do

• 진행 예정
• 진행 완료

📒 기타</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [fix] 광고 API 코드 스타일 프로젝트 컨벤션에 맞게 통일 #124

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