Update requirements.txt

requirements.txt

@@ -1,3 +1,17 @@
-altair
-pandas
-streamlit
+# Core dependencies
+streamlit>=1.20.0
+
+# LangChain & integrations
+langchain>=0.0.500,<0.1.0
+langchain-huggingface>=0.0.20
+langchain-community>=0.1.0
+
+# Hugging Face & embeddings
+transformers>=4.30.0
+sentence-transformers>=2.2.2
+
+# Vector store
+faiss-cpu>=1.7.4
+
+# Utilities
+python-dotenv>=1.0.0  # if you use .env for API tokens