test: improve test infrastructure and fix integration tests

- Add folder to library before scanning in fsnotify integration test
- Update API endpoint paths from /items to /media-items
- Refactor test server setup to support WebSocket hijacking
- Add JobsHandler to test server configuration
- Implement proper job status polling instead of fixed delays
- Consolidate addFolderToLibrary helper into test_helpers.go
- Remove duplicate helper function from media_item_isbn_test.go
- Add error logging for search test failures
- Improve test robustness with better nil handling and type assertions
- Update worker test to use EnqueueJob and poll for completion
- Add global worker instance reset in test cleanup
- Fix media_scanner_test to initialize folders before testing

cmd/server/tests/worker_test.go

@@ -84,10 +84,26 @@ func TestWorker_DirectoryScanJob(t *testing.T) {
 		Status: services.JobStatusPending,
 	}
 
-	services.WorkerInstance.Enqueue(job)
+	// Use EnqueueJob which returns errors
+	err = services.WorkerInstance.EnqueueJob(job)
+	require.NoError(t, err, "Failed to enqueue job")
+	// Poll for job completion
+	timeout := time.Now().Add(10 * time.Second)
+	for time.Now().Before(timeout) {
+		if status, exists := services.WorkerInstance.GetJobStatus(job.ID); exists {
+			if status.Status == services.JobStatusCompleted || status.Status == services.JobStatusFailed {
+				break
+			}
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
 
-	// Wait for job to process
-	time.Sleep(2 * time.Second)
+	// Debug: Check job status after polling
+	if finalStatus, exists := services.WorkerInstance.GetJobStatus(job.ID); exists {
+		t.Logf("Job %s final status: %s, error: %s", job.ID, finalStatus.Status, finalStatus.Error)
+	} else {
+		t.Logf("Job %s not found in results", job.ID)
+	}
 
 	// Check that items were created in database
 	ctx := context.Background()