Update app.py

app.py

@@ -14,7 +14,7 @@ class URLValidator:
 
     def __init__(self):
         # SerpAPI Key
-        self.serpapi_key = SERPAPI_KEY
+        self.serpapi_key = os.getenv("SERPAPI_KEY")
 
         # Load models once to avoid redundant API calls
         self.similarity_model = SentenceTransformer('sentence-transformers/all-mpnet-base-v2')