[BE] feat: SchoolFestivalsV1QueryService 추가 및 Spring Cache 적용 (#862) #746

All 668 tests pass in 33s

198 files ±0 198 suites ±0 33s ⏱️ +3s
668 tests ±0 668 ✅ ±0 0 💤 ±0 0 ❌ ±0
681 runs ±0 681 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit 115c9eb. ± Comparison against earlier commit f52187c.