[REFACTOR] MyChallengeController에 Facade & DCI 패턴 적용 #58

All 290 tests pass in 28s

127 files ±0 127 suites ±0 28s ⏱️ -2s
290 tests ±0 290 ✅ ±0 0 💤 ±0 0 ❌ ±0
298 runs ±0 298 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit aa2d84d. ± Comparison against earlier commit 7d6753d.