feat: 展示 AI 资源创建人信息

- 为 Bot、工作流、知识库、插件列表补充创建人名称回填

- 在卡片中展示创建者与创建时间

- 补充后端与前端对应测试

easyflow-modules/easyflow-module-system/src/test/java/tech/easyflow/system/service/impl/SysAccountServiceImplTest.java

@@ -0,0 +1,54 @@
+package tech.easyflow.system.service.impl;
+
+import com.mybatisflex.core.query.QueryWrapper;
+import org.junit.Test;
+
+import tech.easyflow.system.entity.SysAccount;
+
+import java.math.BigInteger;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+/**
+ * {@link SysAccountServiceImpl} 测试。
+ */
+public class SysAccountServiceImplTest {
+
+    /**
+     * 验证展示名解析优先级与缺失数据回退。
+     */
+    @Test
+    public void shouldResolveDisplayNameByNicknameThenLoginNameThenId() {
+        SysAccountServiceImpl service = spy(new SysAccountServiceImpl());
+
+        SysAccount nicknameAccount = new SysAccount();
+        nicknameAccount.setId(BigInteger.ONE);
+        nicknameAccount.setNickname("管理员");
+        nicknameAccount.setLoginName("admin");
+
+        SysAccount loginNameAccount = new SysAccount();
+        loginNameAccount.setId(BigInteger.valueOf(2));
+        loginNameAccount.setNickname("   ");
+        loginNameAccount.setLoginName("operator");
+
+        doReturn(List.of(nicknameAccount, loginNameAccount))
+                .when(service)
+                .list(any(QueryWrapper.class));
+
+        Map<BigInteger, String> displayNameMap = service.resolveDisplayNameMap(
+                List.of(BigInteger.ONE, BigInteger.valueOf(2), BigInteger.valueOf(3))
+        );
+
+        assertEquals("管理员", displayNameMap.get(BigInteger.ONE));
+        assertEquals("operator", displayNameMap.get(BigInteger.valueOf(2)));
+        assertEquals("3", displayNameMap.get(BigInteger.valueOf(3)));
+        verify(service, times(1)).list(any(QueryWrapper.class));
+    }
+}