링고비즈api추가

design/backend/api/analytics-service-api.yaml

@@ -23,7 +23,7 @@ info:
     - Circuit Breaker with fallback to cached data
 
     **Caching Strategy:**
-    - Redis cache with 5-minute TTL
+    - Redis cache with 1-hour TTL (3600 seconds)
     - Cache-Aside pattern for dashboard data
     - Real-time updates via Kafka event subscription
   version: 1.0.0