Update requirements.txt

requirements.txt

@@ -1,10 +1,28 @@
-gradio
-langchain>=0.1.0
-langchain-openai>=0.0.5
-langchain-community>=0.0.16
-langgraph>=0.0.26
-python-dotenv
-wikipedia-api
+# Core
+langchain==0.2.0
+langchain-core==0.2.0
+langgraph==0.0.38
+
+# OpenAI (GPT-4.1)
+langchain-openai>=0.1.5
+openai>=1.15.0
+
+# Other providers (opzionali / fallback)
+#langchain-google-genai
+#langchain-groq
+#langchain-huggingface
+
+# Tools & deps
+langchain-community
+langchain-tavily
+langchain-chroma
+huggingface_hub
+supabase
 arxiv
+pymupdf
+wikipedia
+pgvector
+python-dotenv
+requests
+gradio
 pandas
-requests