Update requirements.txt

requirements.txt

@@ -1,9 +1,17 @@
-langchain
-langchain_community
-langchain-google-genai
-gradio
-python-dotenv
-huggingface_hub
-openai
-langchain_openai
-langchain.chains
+# Core LangChain ecosystem
+langchain>=0.2.0
+langchain-community>=0.2.0
+langchain-openai>=0.2.0
+langchain-google-genai>=0.2.0
+
+# Web and interface
+gradio>=4.44.0
+
+# Environment handling
+python-dotenv>=1.0.0
+
+# Hugging Face utilities
+huggingface_hub>=0.23.0
+
+# OpenAI client
+openai>=1.30.0