Initial scaffold: full-stack RackMapper application

Complete project scaffold with working auth, REST API, Prisma/SQLite
schema, Docker config, and React frontend for both Rack Planner and
Service Mapper modules. Both server and client pass TypeScript strict
mode with zero errors. Initial migration applied.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/src/components/auth/ProtectedRoute.tsx

@@ -0,0 +1,17 @@
+import type { ReactNode } from 'react';
+import { Navigate } from 'react-router-dom';
+import { useAuthStore } from '../../store/useAuthStore';
+
+interface ProtectedRouteProps {
+  children: ReactNode;
+}
+
+export function ProtectedRoute({ children }: ProtectedRouteProps) {
+  const { isAuthenticated } = useAuthStore();
+
+  if (!isAuthenticated) {
+    return <Navigate to="/login" replace />;
+  }
+
+  return <>{children}</>;
+}