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/lib/apiFetch.ts

@@ -0,0 +1,11 @@
+import { treaty } from '@elysiajs/eden'
+import type { ServerApp } from '..'
+
+const URL = process.env.BUN_PUBLIC_BASE_URL
+if (!URL) {
+  throw new Error('BUN_PUBLIC_BASE_URL is not defined')
+}
+
+const apiFetch = treaty<ServerApp>(URL)
+
+export default apiFetch