Initial project scaffolding for health tracker app

Set up backend and frontend structure for a health and fitness tracker using Python (FastAPI, SQLModel, DSPy) and React. Includes Docker and Compose configs, authentication, nutrition AI module, health/nutrition/user endpoints, database models, and basic frontend with routing and context. Enables tracking nutrition, health metrics, and user management, with architecture ready for future mobile and cloud deployment.

frontend/src/components/ProtectedRoute.jsx

@@ -0,0 +1,13 @@
+import { useContext } from 'react';
+import { Navigate } from 'react-router-dom';
+import { AuthContext } from '../context/AuthContext';
+
+const ProtectedRoute = ({ children }) => {
+    const { token, loading } = useContext(AuthContext);
+
+    if (loading) return <div>Loading...</div>;
+    if (!token) return <Navigate to="/login" />;
+
+    return children;
+};
+export default ProtectedRoute;