rework: ChromaDB update requirements.txt

requirements.txt

@@ -1,5 +1,5 @@
 langchain>=1.2.10
 langchain-ollama>=0.3.0
-langchain-qdrant>=0.2.1
+langchain-chroma>=0.2.0
 langchain-text-splitters>=0.3.0
-qdrant-client>=1.9.0
+chromadb>=0.5.0