refactor(frontend): migrate from Vite to Nuxt SPA

Replace Vite and Vue Router with Nuxt framework
Update Docker, build scripts, and env vars for Nuxt generate

frontend/middleware/auth.global.ts

@@ -0,0 +1,40 @@
+import { api, getAuthToken, setAuthToken } from '../src/services/api';
+
+export default defineNuxtRouteMiddleware(async (to) => {
+  const requiredPermissions = to.matched
+    .map((record) => record.meta.requiredPermission)
+    .filter((permission): permission is string => typeof permission === 'string');
+  const requiredAnyPermissions = to.matched.flatMap((record) =>
+    Array.isArray(record.meta.requiredAnyPermission)
+      ? record.meta.requiredAnyPermission.filter((permission): permission is string => typeof permission === 'string')
+      : []
+  );
+  const requiresVerified = to.matched.some((record) => record.meta.requiresVerified === true) || requiredPermissions.length > 0 || requiredAnyPermissions.length > 0;
+  const requiresAuth = requiresVerified || to.matched.some((record) => record.meta.requiresAuth === true);
+
+  if (!requiresAuth) {
+    return;
+  }
+
+  if (!getAuthToken()) {
+    return navigateTo({ path: '/login', query: { redirect: to.fullPath } });
+  }
+
+  try {
+    const response = await api.me();
+    if (requiresVerified && !response.user.emailVerified) {
+      return navigateTo({ path: '/login', query: { redirect: to.fullPath } });
+    }
+
+    const permissionSet = new Set(response.user.permissions);
+    if (requiredPermissions.some((permission) => !permissionSet.has(permission))) {
+      return navigateTo('/pokemon');
+    }
+    if (requiredAnyPermissions.length && !requiredAnyPermissions.some((permission) => permissionSet.has(permission))) {
+      return navigateTo('/pokemon');
+    }
+  } catch {
+    setAuthToken(null);
+    return navigateTo({ path: '/login', query: { redirect: to.fullPath } });
+  }
+});