fix: 설정 화면 진입 시 크래시 수정

- AppDatabase.kt 누락된 닫는 괄호 추가
- PermissionHelper.canInstallUnknownApps() SecurityException 처리

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

app/src/main/java/com/hotdeal/alarm/data/local/db/AppDatabase.kt

@@ -60,5 +60,6 @@ abstract class AppDatabase : RoomDatabase() {
  override fun migrate(db: SupportSQLiteDatabase) {
  db.execSQL("ALTER TABLE hot_deals ADD COLUMN isFavorite INTEGER NOT NULL DEFAULT 0")
  }
-    }
+ }
+ }
 }