feat: 增强管理端工作台用户活跃榜能力

- 新增用户活跃榜接口、筛选与导出能力

- 支持按智能体过滤排行榜并补充前后端测试

easyflow-modules/easyflow-module-chatlog/src/test/java/tech/easyflow/chatlog/repository/analyticaldb/ChatAnalyticalDBRepositoryTest.java

@@ -104,6 +104,28 @@ public class ChatAnalyticalDBRepositoryTest {
         Assert.assertTrue(operations.lastQuerySql.contains("(agg.assistant_id IN (?) OR agg.assistant_id IS NULL)"));
     }
 
+    /**
+     * 验证用户活跃榜支持按智能体过滤，且导出场景可不带 limit。
+     */
+    @Test
+    public void shouldSupportAssistantFilterAndUnlimitedUserRanks() {
+        RecordingAnalyticalDBOperations operations = new RecordingAnalyticalDBOperations();
+
+        ChatAnalyticalDBRepository repository = newRepository(operations);
+        repository.queryActiveUserRanks(
+                LocalDate.of(2026, 4, 1),
+                LocalDate.of(2026, 4, 8),
+                BigInteger.ONE,
+                BigInteger.TEN,
+                null
+        );
+
+        Assert.assertNotNull(operations.lastQuerySql);
+        Assert.assertTrue(operations.lastQuerySql.contains("AND agg.assistant_id = ?"));
+        Assert.assertTrue(operations.lastQuerySql.contains("ORDER BY agg.session_total DESC, agg.message_total DESC, agg.user_id ASC"));
+        Assert.assertFalse(operations.lastQuerySql.contains("LIMIT ?"));
+    }
+
     /**
      * 构造仓储实例。
      *