update classifier model

src/analyzer.py

@@ -19,7 +19,7 @@ class EventAnalyzer:
         
         # Initialize NLP pipelines
         self.ner_pipeline = pipeline("ner", model="dbmdz/bert-large-cased-finetuned-conll03-english")
-        self.classifier = pipeline("zero-shot-classification")
+        self.classifier = pipeline("zero-shot-classification", model="facebook/bart-large-mnli")
 
     async def extract_entities(self, text: str) -> Dict[str, List[str]]:
         """Extract entities from text using NER pipeline."""