refactor: remove duplicate metrics aggregator service from rqueue-web

Clean up duplicate RqueueJobMetricsAggregatorService from rqueue-web/src/main/java after moving the interface to rqueue-core/metrics as RqueueMetricsAggregatorService.

Move the test RqueueTaskMetricsAggregatorServiceTest from rqueue-web to rqueue-core/src/test/java/com/github/sonus21/rqueue/metrics/, updating package declarations and class references to use the renamed RqueueMetricsAggregatorService.

This ensures a single source of truth for the metrics aggregator interface in the core module.

Assisted-By: Claude Code

Author: sonus21

…eueTaskMetricsAggregatorServiceTest.java …eueTaskMetricsAggregatorServiceTest.javarqueue-web/src/test/java/com/github/sonus21/rqueue/web/service/RqueueTaskMetricsAggregatorServiceTest.java renamed to rqueue-core/src/test/java/com/github/sonus21/rqueue/metrics/RqueueTaskMetricsAggregatorServiceTest.java rqueue-web/src/test/java/com/github/sonus21/rqueue/web/service/RqueueTaskMetricsAggregatorServiceTest.java renamed to rqueue-core/src/test/java/com/github/sonus21/rqueue/metrics/RqueueTaskMetricsAggregatorServiceTest.java

@@ -14,7 +14,7 @@
  *
  */
 
-package com.github.sonus21.rqueue.web.service;
+package com.github.sonus21.rqueue.metrics;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
@@ -88,12 +88,12 @@ class RqueueTaskMetricsAggregatorServiceTest extends TestBase {
   @Mock
   private MessageBroker messageBroker;
 
-  private RqueueJobMetricsAggregatorService rqueueJobMetricsAggregatorService;
+  private RqueueMetricsAggregatorService rqueueJobMetricsAggregatorService;
 
   @BeforeEach
   public void initService() throws IllegalAccessException {
     MockitoAnnotations.openMocks(this);
-    rqueueJobMetricsAggregatorService = new RqueueJobMetricsAggregatorService(
+    rqueueJobMetricsAggregatorService = new RqueueMetricsAggregatorService(
         rqueueConfig, rqueueWebConfig, rqueueLockManager, rqueueQStatsDao);
     doReturn(true).when(rqueueWebConfig).isCollectListenerStats();
     doReturn(1).when(rqueueWebConfig).getStatsAggregatorThreadCount();