콘텐츠 메인 무료 탭 API

= url -> /free로 변경

src/main/kotlin/kr/co/vividnext/sodalive/content/main/tab/free/AudioContentMainTabFreeController.kt

@@ -9,7 +9,7 @@ import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RestController
 
 @RestController
-@RequestMapping("/v2/audio-content/main/series")
+@RequestMapping("/v2/audio-content/main/free")
 class AudioContentMainTabFreeController(private val service: AudioContentMainTabFreeService) {
     @GetMapping
     fun fetchContentMainFree(