Update tech stack in Gradio interface to use OpenAI GPT-5-mini

app.py

@@ -207,7 +207,7 @@ def create_gradio_interface():
         - **Frontend**: Gradio UI deployed on Hugging Face Spaces using Docker containerization
         - **Separation**: Backend API + Frontend UI
         
-        **🔧 Tech Stack**: OpenAI GPT-4o-mini + LangChain orchestration, Python FastAPI, ChromaDB vector database, Docker containerization
+        **🔧 Tech Stack**: OpenAI GPT-5-mini + LangChain orchestration, Python FastAPI, ChromaDB vector database, Docker containerization
         
         **📖 Learn More**: [README with technical details](https://huggingface.co/spaces/krinya/smart_routing_with_render_example/blob/main/README.md)  
         **💻 Backend API Code**: [GitHub Repository](https://github.com/krinya/gen_ai_demo_rag_bot/tree/main)
@@ -299,7 +299,7 @@ def create_gradio_interface():
         **🚀 Deployment Info**: This prototype is powered by a FastAPI backend deployed on [Render](https://render.com), 
         showcasing full-stack development knowledge.
         
-        **🛠️ Tech Stack**: LangChain • OpenAI GPT-4o-mini • ChromaDB • FastAPI • Render • Gradio • Hugging Face Spaces • CI/CD
+        **🛠️ Tech Stack**: LangChain • OpenAI GPT-5-mini • ChromaDB • FastAPI • Render • Gradio • Hugging Face Spaces • CI/CD
         """)
         
         # Event handlers