chore: domain 이름 변경

Author: dlsrks1021

backend/src/main/java/io/f1/backend/global/config/CorsConfig.java

@@ -15,7 +15,7 @@ public CorsConfigurationSource corsConfigurationSource() {
 
         config.addAllowedOrigin("http://localhost:3000");
         config.addAllowedOrigin("https://brainrace.duckdns.org");
-        config.addAllowedOrigin("https://api.brainrace.duckdns.org");
+        config.addAllowedOrigin("https://api-brainrace.duckdns.org");
 
         config.addAllowedHeader("*");
         config.addAllowedMethod("*");