feat: initialize landing application with Vite and Mantine configuration

apps/landing/vite.config.ts

@@ -0,0 +1,11 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import tailwindcss from '@tailwindcss/vite';
+
+export default defineConfig({
+  plugins: [react(), tailwindcss()],
+  server: {
+    port: 3000,
+    strictPort: true, // Evacuated from 517x range to avoid electron-vite port collision.
+  },
+});