Add requirements.txt

requirements.txt

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+# Core dependencies
+openai>=1.0.0
+gradio>=5.0.0
+plotly>=5.18.0
+pandas>=2.0.0
+networkx>=3.2
+datasets>=2.16.0
+tiktoken>=0.5.0
+
+# TigerGraph
+pyTigerGraph>=1.6
+
+# Evaluation
+ragas>=0.2.0
+langchain-openai>=0.1.0
+langchain-core>=0.2.0
+
+# Embeddings (optional local fallback)
+sentence-transformers>=2.2.0
+
+# Utilities
+python-dotenv>=1.0.0
+numpy>=1.24.0
+tqdm>=4.65.0