Merge pull request #70 from Decodeat/Refactor/#64

Fix: ROLE_ 접두사가 중복 삭제

Author: Yujin1219

src/main/java/com/DecodEat/global/config/jwt/JwtTokenProvider.java

@@ -86,7 +86,7 @@ public Authentication getAuthentication(String token) {
 
         // 2. Create the authority with the required "ROLE_" prefix.
         Set<SimpleGrantedAuthority> authorities = Collections.singleton(
-                new SimpleGrantedAuthority("ROLE_" + userRole)
+                new SimpleGrantedAuthority(userRole)
         );
         Long userId = claims.get("id", Long.class);