feat(fcm): 푸시 알림함 저장 및 카테고리 조회를 지원한다

src/main/kotlin/kr/co/vividnext/sodalive/fcm/FcmService.kt

@@ -128,17 +128,7 @@ class FcmService(
     }
 
     private fun createDeepLink(deepLinkValue: FcmDeepLinkValue?, deepLinkId: Long?): String? {
-        if (deepLinkValue == null || deepLinkId == null) {
-            return null
-        }
-
-        val uriScheme = if (serverEnv.equals("voiceon", ignoreCase = true)) {
-            "voiceon"
-        } else {
-            "voiceon-test"
-        }
-
-        return "$uriScheme://${deepLinkValue.value}/$deepLinkId"
+        return buildDeepLink(serverEnv, deepLinkValue, deepLinkId)
     }
 
     fun sendPointGranted(tokens: List<String>, point: Int) {
@@ -206,4 +196,24 @@ class FcmService(
             logger.error("[FCM] ❌ 최종 실패 대상 ${targets.size}명 → $targets")
         }
     }
+
+    companion object {
+        fun buildDeepLink(
+            serverEnv: String,
+            deepLinkValue: FcmDeepLinkValue?,
+            deepLinkId: Long?
+        ): String? {
+            if (deepLinkValue == null || deepLinkId == null) {
+                return null
+            }
+
+            val uriScheme = if (serverEnv.equals("voiceon", ignoreCase = true)) {
+                "voiceon"
+            } else {
+                "voiceon-test"
+            }
+
+            return "$uriScheme://${deepLinkValue.value}/$deepLinkId"
+        }
+    }
 }