feat: solution for 'Агент с RAG-памятью'

.env.example

@@ -1,3 +1,2 @@
-# OpenAI API key (optional). If not set, the LLM will use a simple echo fallback.
-OPENAI_API_KEY=
-PORT=3000
+# Copy this file to .env and replace with your actual OpenAI API key
+OPENAI_API_KEY=sk-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX