feat: 보안 설정 추가

Author: luna111122

src/main/java/org/muses/backendbulidtest251228/global/config/SecurityConfig.java

@@ -48,6 +48,7 @@ public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
 				.requestMatchers("/api/checkin/result", "/checkin/result").permitAll()
 				.requestMatchers("/api/auth/profile/**", "/api/users/me/**").authenticated()
 				.requestMatchers("/login/**", "/auth/callback", "/api/auth/**", "/oauth2/**", "/api/projects/**", "/api/alarms/**", "/api/events/**", "/health", "/error").permitAll()
+                    .requestMatchers(org.springframework.http.HttpMethod.POST, "/api/creators/me/applications").authenticated()
 				.requestMatchers("/api/creators/**").hasRole("CREATOR")
 				.requestMatchers("/api/admin/**").hasRole("ADMIN")
 				// TODO 정적 파일 (업로드된 이미지) 허용