Fix expired ingest task stuck state

backend/src/test/java/com/music/service/ProgressMessageMappingTest.java

@@ -8,6 +8,7 @@ import java.lang.reflect.Method;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
@@ -159,4 +160,19 @@ class ProgressMessageMappingTest {
         com.music.common.Result<?> result = controller.start(new com.music.dto.IngestRequest());
         assertTrue(result.getCode() == 0);
     }
+
+    @Test
+    void ingestControllerTreatsMissingStoppedTaskAsTerminal() throws Exception {
+        ConfigService cfgService = mock(ConfigService.class);
+        ProgressStore store = new ProgressStore();
+        com.music.controller.IngestController controller = new com.music.controller.IngestController(
+                mock(IngestService.class), store, cfgService);
+
+        com.music.common.Result<com.music.dto.IngestStatusResponse> result =
+                controller.statusById("expired-task");
+
+        assertFalse(result.getData().isRunning());
+        assertTrue(result.getData().isCompleted());
+        assertEquals("未找到任务或已过期", result.getData().getMessage());
+    }
 }