fix: 공개 코스 쓰기 작업 시 관련 캐시 즉시 무효화 (dev)

[unam98]

작업 배경

dev/main 브랜치 정합성을 점검하다가, main엔 이미 반영된 캐시 무효화 로직(#208)이 dev엔 빠져있는 걸 발견했다.

변경 사항

영역	내용
CourseService.deleteCourses	캐시 무효화 추가 (조건부로 공개 코스도 같이 삭제될 수 있어 매번 무효화)
PublicCourseService.createPublicCourse / deletePublicCourses / updatePublicCourse	각각 영향받는 목록 캐시 무효화 추가

영향 범위

• dev는 조회 캐싱(@Cacheable, TTL 1분)만 있고 무효화(@CacheEvict)가 없어서, 코스를 추가/삭제하거나 공개 코스를 수정해도 최대 1분간 오래된 목록이 그대로 보이던 문제가 있었음.
• main의 검증된 로직을 그대로 포팅 — 로직 변경 없이 동일하게 반영.

Test Plan

• ./gradlew compileJava 성공, dev 브랜치의 두 파일이 main과 완전히 동일함을 git diff origin/main으로 확인
• 로컬 postgres/redis 기동 후 ./gradlew test 전체 251/251 통과

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📥 Commits

Reviewing files that changed from the base of the PR and between b070376 and aaca0a6.

📒 Files selected for processing (2)

• src/main/java/org/runnect/server/course/service/CourseService.java
• src/main/java/org/runnect/server/publicCourse/service/PublicCourseService.java

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