chore: initialize git repo, add matplotlib dep, extend config

- Add .gitignore for Python/data/models
- Add matplotlib>=3.8.0 for eval plots
- Add PretrainConfig, FinetuneConfig, BalabitAdapterConfig, EvalConfig dataclasses

main.py

@@ -0,0 +1,19 @@
+# sites/ai_mouse/main.py
+"""ai-mouse web UI entry point.
+
+Usage:
+    uv run python sites/ai_mouse/main.py
+"""
+from __future__ import annotations
+
+import webbrowser
+
+import uvicorn
+
+from ai_mouse.server import create_app
+
+app = create_app()
+
+if __name__ == "__main__":
+    webbrowser.open("http://127.0.0.1:8765")
+    uvicorn.run(app, host="127.0.0.1", port=8765)