refactor: update predict function return type and remove obsolete test script

app.py

@@ -15,7 +15,7 @@ print("Model loaded successfully.")
 
 @app.api(name="predict")
 @spaces.GPU
-def predict(text: str):
+def predict(text: str) -> list:
     """Detect PII in the given text and return aggregated spans."""
     results = classifier(text)
     

test.py

@@ -1,11 +0,0 @@
-from transformers import pipeline
-import json
-
-classifier = pipeline(
-    task="token-classification",
-    model="openai/privacy-filter",
-    aggregation_strategy="simple"
-)
-
-res = classifier("My name is Alice Smith and my email is alice@example.com.")
-print(json.dumps(res, indent=2))