feat: Upstage 게시글 요약 API 연동 추가

[taejinn]

🚀 주요 변경 내용

• Upstage solar-pro3 Chat API를 호출하는 클라이언트를 추가했습니다.
• JSON 응답 변환과 HTTP 오류 분류, Retry-After 해석을 추가했습니다.
• API 주소, 키, 요청 제한 시간과 모델 설정을 환경 변수로 관리하도록 구성했습니다.

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💬 참고 사항

• 관련 이슈: [공통] 게시글 요약 #2248
• 게시글 AI 요약 생성 규칙 PR을 기반으로 합니다.
• API 키가 없거나 기능 설정이 비활성화된 경우 요약 작업을 실행하지 않습니다.
• UpstageRetryAfterResolverTest를 통과했습니다.

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✅ Checklist (완료 조건)

• 코드 스타일 가이드 준수
• 테스트 코드 포함됨
• Reviewers / Assignees / Labels 지정 완료
• 보안 및 민감 정보 검증 (API 키, 환경 변수, 개인정보 등)

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5cf49598-4aa8-4f97-8f0a-6ff09e39f98f

📥 Commits

Reviewing files that changed from the base of the PR and between f951438 and 3e59c66.

📒 Files selected for processing (8)

• src/main/java/in/koreatech/koin/domain/community/article/service/summary/ArticleAiSummaryProperties.java
• src/main/java/in/koreatech/koin/domain/community/article/service/summary/ArticleSummaryAiClient.java
• src/main/java/in/koreatech/koin/domain/community/article/service/summary/ArticleSummaryExternalApiException.java
• src/main/java/in/koreatech/koin/infrastructure/upstage/client/UpstageArticleSummaryClient.java
• src/main/java/in/koreatech/koin/infrastructure/upstage/client/UpstageProperties.java
• src/main/java/in/koreatech/koin/infrastructure/upstage/client/UpstageRetryAfterResolver.java
• src/main/resources/application.yml
• src/test/java/in/koreatech/koin/infrastructure/upstage/client/UpstageRetryAfterResolverTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/2248-ai-summary-upstage-chat

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[github-actions]

Unit Test Results

731 tests   728 ✔️  1m 20s ⏱️
178 suites      3 💤
178 files        0 ❌

Results for commit 3e59c66.