feat: PWA setup + /app base path

- Landing page at /
- Vue app at /app (PWA installable)
- Added manifest.json for mobile install
- iOS + Android meta tags
- Updated router base path

src/router/index.ts

@@ -2,7 +2,7 @@ import { createRouter, createWebHistory } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
 
 const router = createRouter({
-  history: createWebHistory(),
+  history: createWebHistory('/app/'),
   routes: [
     {
       path: '/login',