feat(home): 첫 오디오 콘텐츠 가격을 응답한다

src/test/kotlin/kr/co/vividnext/sodalive/v2/api/home/dto/HomeRecommendationResponseTest.kt

@@ -22,6 +22,7 @@ class HomeRecommendationResponseTest {
                     creatorNickname = "creator",
                     creatorProfileImage = "https://cdn.test/profile/creator.png",
                     title = "first audio",
+                    price = 9,
                     coverImage = "https://cdn.test/cover/audio.png",
                     releaseDate = "2026-06-01T00:00:00Z",
                     isPointAvailable = true
@@ -59,6 +60,7 @@ class HomeRecommendationResponseTest {
 
         val json = objectMapper.readTree(objectMapper.writeValueAsString(response))
 
+        assertEquals(9, json["firstAudioContents"][0]["price"].asInt())
         assertEquals(true, json["firstAudioContents"][0]["isPointAvailable"].asBoolean())
         assertFalse(json["firstAudioContents"][0].has("pointAvailable"))
         assertEquals("https://cdn.test/profile/character.png", json["aiCharacters"][0]["profileImage"].asText())