Add model selection and local RAG

README.md

@@ -1,6 +1,6 @@
 # llm_web
 
-Local LLM chat web page powered by Ollama and `qwen2.5:7b`.
+Local LLM chat web page powered by Ollama.
 
 ## Run
 
@@ -23,3 +23,26 @@ http://<notebook-ip>:8787
 ```
 
 Chat history is stored locally in `data/chats.json`. The `data/*.json` files are ignored by Git.
+
+## Models
+
+The web UI can switch between installed Ollama models:
+
+- `qwen2.5:7b`: default, best speed/quality balance on this notebook
+- `llama3.1:8b`: available for comparison
+- `qwen2.5:14b`: test-only; can be slow or memory hungry on 16 GB RAM
+- `qwen2.5:3b`: fallback model
+
+Recent quick benchmark:
+
+```text
+qwen2.5:7b   18.0s
+llama3.1:8b  32.4s
+qwen2.5:14b  82.7s
+```
+
+## RAG
+
+RAG is enabled by default. The server indexes local `.md`, `.txt`, `.py`, `.js`, `.html`, `.css`, and `.ps1` files, excluding `.git`, `.venv`, `__pycache__`, and `data`.
+
+Use the `Reindex files` button after adding or editing reference files.