fix: 떡국 완성하기 API가 인가 필터를 타지 않는 버그 수정 (#105)

src/main/java/com/tteokguk/tteokguk/global/security/matcher/CustomRequestMatcher.java

@@ -19,7 +19,7 @@ public RequestMatcher authEndpoints() {
     public RequestMatcher mainPageEndPoints() {
         return new OrRequestMatcher(
                 new AntPathRequestMatcher("/api/v1/tteokguk/new/**"),
-                new AntPathRequestMatcher("/api/v1/tteokguk/completion/**"),
+                new AntPathRequestMatcher("/api/v1/tteokguk/completion/**", HttpMethod.GET.toString()),
                 new AntPathRequestMatcher("/api/v1/tteokguk/random/**")
         );
     }