fix: clean requirements.txt for HF Spaces build

requirements.txt

@@ -4,20 +4,20 @@ uvicorn[standard]==0.30.6
 pydantic==2.7.4
 
 # LLM + fine-tuned model
-torch==2.3.1          # CPU or CUDA — Docker will handle CUDA variant
+torch==2.3.1
 transformers==4.51.3
 peft==0.15.2
-bitsandbytes==0.43.3  # CPU-compatible for Docker; swap 0.49.2 if CUDA 12.8
+bitsandbytes==0.43.3
 accelerate==1.6.0
 
 # RAG
 langchain==1.2.13
 langchain-community==0.4.1
+langchain-classic==1.0.3
+langchain-groq==1.1.2
+groq==0.37.1
 pinecone==7.3.0
 sentence-transformers==4.1.0
 
 # Utilities
-python-dotenv==1.0.1
-
-groq==0.37.1
-langchain-groq==1.1.2
+python-dotenv==1.0.1