fix: CacheConfig에 VESSEL_ANALYSIS 상수 누락 — 빌드 실패 수정

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/src/main/java/gc/mda/kcg/config/CacheConfig.java

@@ -20,6 +20,7 @@ public class CacheConfig {
     public static final String SATELLITES = "satellites";
     public static final String SEISMIC = "seismic";
     public static final String PRESSURE = "pressure";
+    public static final String VESSEL_ANALYSIS = "vessel-analysis";
 
     @Bean
     public CacheManager cacheManager() {
@@ -27,7 +28,8 @@ public class CacheConfig {
                 AIRCRAFT_IRAN, AIRCRAFT_KOREA,
                 OSINT_IRAN, OSINT_KOREA,
                 SATELLITES,
-                SEISMIC, PRESSURE
+                SEISMIC, PRESSURE,
+                VESSEL_ANALYSIS
         );
         manager.setCaffeine(Caffeine.newBuilder()
                 .expireAfterWrite(2, TimeUnit.DAYS)