fix: remove core LogIndexService to fix CI snapshot resolution

LogIndexService in server-core imported LogEntry from cameleer3-common,
but the SNAPSHOT on the registry may not have it yet when the server CI
runs. Moved the dependency to server-app where both the controller and
OpenSearch implementation live.

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

cameleer3-server-core/src/main/java/com/cameleer3/server/core/logging/LogIndexService.java

@@ -1,10 +0,0 @@
-package com.cameleer3.server.core.logging;
-
-import com.cameleer3.common.model.LogEntry;
-
-import java.util.List;
-
-public interface LogIndexService {
-
-    void indexBatch(String agentId, String application, List<LogEntry> entries);
-}