Fix build: remove torch/sentence-transformers (Space uses Azure embeddings)

requirements.txt

@@ -1,15 +1,12 @@
---extra-index-url https://download.pytorch.org/whl/cpu
-torch>=2.0.0
-chromadb>=1.5.4
-langchain>=0.3.25
-langgraph>=1.0.1
-langchain-openai>=0.3.23
-langchain-neo4j>=0.4.0
-sentence-transformers==3.3.1
-transformers>=4.57.0
-huggingface_hub>=1.6.0
-neo4j>=5.28.1
-gradio>=6.6.0
-requests>=2.31.0
-python-dotenv>=1.0.0
-numpy>=1.24.0
+chromadb>=1.5.4
+langchain>=0.3.25
+langgraph>=1.0.1
+langchain-openai>=0.3.23
+langchain-neo4j>=0.4.0
+huggingface_hub>=1.6.0
+neo4j>=5.28.1
+gradio>=6.6.0
+requests>=2.31.0
+python-dotenv>=1.0.0
+numpy>=1.24.0
+openai>=1.0.0