test: use dynamic path helper for upload folder test

- Replace hardcoded /app/uploads with getUploadPath()
- Update assertions to use dynamic paths
- Improve test log message to show actual path used
- Ensures tests work in both container and host environments

cmd/server/tests/universal_progress_integration_test.go

@@ -211,7 +211,7 @@ func TestPhase1Integration(t *testing.T) {
 	// Step 3: Add /app/uploads folder to the library
 	t.Run("Step3_AddUploadsFolder", func(t *testing.T) {
 		folderReq := map[string]interface{}{
-			"folder_path": "/app/uploads",
+			"folder_path": getUploadPath(),
 		}
 
 		body, _ := json.Marshal(folderReq)
@@ -230,9 +230,9 @@ func TestPhase1Integration(t *testing.T) {
 		var result map[string]interface{}
 		json.NewDecoder(resp.Body).Decode(&result)
 
-		assert.Equal(t, "/app/uploads", result["folder_path"])
+		assert.Equal(t, getUploadPath(), result["folder_path"])
 
-		t.Logf("✅ Step 3 PASSED: /app/uploads folder added to library")
+		t.Logf("✅ Step 3 PASSED: %s folder added to library", getUploadPath())
 	})
 
 	// Step 4: Scan the library