feat: implement user authentication and dashboard

Adds a complete user authentication system and a protected dashboard.

- Implements JWT-based authentication using ElysiaJS.
- Integrates Prisma for database access and user management.
- Creates a login page and protected routes for the dashboard.
- Adds a dashboard layout with pages for API key management.
- Includes necessary UI components from Mantine.

src/components/ProtectedRoute.tsx

@@ -0,0 +1,25 @@
+import { useEffect, useState } from 'react'
+import { Navigate, Outlet } from 'react-router-dom'
+import clientRoutes from '@/clientRoutes'
+import apiFetch from '@/lib/apiFetch'
+
+export default function ProtectedRoute() {
+  const [isAuthenticated, setIsAuthenticated] = useState<boolean | null>(null)
+
+  useEffect(() => {
+    async function checkSession() {
+      try {
+        // backend otomatis baca cookie JWT dari request
+        const res = await apiFetch.api.user.find.get()
+        setIsAuthenticated(res.status === 200)
+      } catch {
+        setIsAuthenticated(false)
+      }
+    }
+    checkSession()
+  }, [])
+
+  if (isAuthenticated === null) return null // or loading spinner
+  if (!isAuthenticated) return <Navigate to={clientRoutes['/login']} replace />
+  return <Outlet />
+}