Revert Hazelcast cache to simple — HazelcastInstance lifecycle conflict with Spring Boot 4

Hazelcast CacheManager fails to auto-configure due to bean lifecycle ordering
(HazelcastInstance shuts down during context initialization). Reverted to
simple in-memory cache. Hazelcast distributed caching needs separate
investigation for Spring Boot 4 compatibility.

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

Author: aksOps

src/main/resources/application.yml

@@ -56,7 +56,7 @@ spring:
   main:
     log-startup-info: false
   cache:
-    type: hazelcast
+    type: simple
 
 logging:
   level: