feat: initialize frontend with React, Vite, and Tailwind CSS

- Added package.json for project dependencies and scripts.
- Configured PostCSS with Tailwind CSS.
- Created main application structure with App component and routing.
- Implemented API client for handling requests with Axios.
- Developed authentication API for login, logout, and user verification.
- Created entities API for managing virtual entities.
- Implemented logs API for fetching dispatch logs.
- Added navigation bar component for app navigation.
- Created protected route component for route guarding.
- Set up global CSS with Tailwind directives.
- Configured main entry point for React application.
- Developed basic Dashboard and Login pages.
- Set up router for application navigation.
- Added Jest testing setup for testing library.
- Configured Tailwind CSS with content paths.
- Set TypeScript configuration for frontend.
- Created Vite configuration for development and production builds.
- Added Nginx configuration for serving the application and proxying API requests.

frontend/src/pages/DashboardPage.tsx

@@ -0,0 +1,8 @@
+export default function DashboardPage() {
+  return (
+    <div className="p-8">
+      <h1 className="text-2xl font-bold text-gray-900">Dashboard</h1>
+      <p className="mt-2 text-sm text-gray-500">Dashboard — coming in Step 11.</p>
+    </div>
+  )
+}

frontend/src/pages/LoginPage.tsx

@@ -0,0 +1,12 @@
+export default function LoginPage() {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-gray-50">
+      <div className="w-full max-w-sm rounded-lg bg-white p-8 shadow">
+        <h1 className="mb-6 text-2xl font-bold text-gray-900">
+          Condado Abaixo da Média SA
+        </h1>
+        <p className="text-sm text-gray-500">Login page — coming in Step 11.</p>
+      </div>
+    </div>
+  )
+}