feat(pwa): transform auraajenticai.cloud into installable PWA app with client dashboard gateway

sw.js

@@ -0,0 +1,81 @@
+// Aura Cloud Service Worker — High-Performance Offline & Shell Cache v1.0
+const CACHE_NAME = 'aura-cloud-pwa-v1';
+
+const STATIC_PRECACHE = [
+  '/',
+  '/index.html',
+  '/manifest.json',
+  '/logo.png',
+  '/apple-touch-icon.png',
+  '/icon-192.png',
+  '/icon-512.png',
+  '/icon-maskable-192.png',
+  '/icon-maskable-512.png',
+  '/privacy.html',
+  '/terms.html'
+];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => {
+      return cache.addAll(STATIC_PRECACHE).catch((err) => {
+        console.warn('[Aura PWA SW] Pre-cache initial warning:', err);
+      });
+    }).then(() => self.skipWaiting())
+  );
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((keys) => {
+      return Promise.all(
+        keys.filter((k) => k !== CACHE_NAME).map((k) => caches.delete(k))
+      );
+    }).then(() => self.clients.claim())
+  );
+});
+
+self.addEventListener('fetch', (event) => {
+  const req = event.request;
+  const url = new URL(req.url);
+
+  // 1. Bypass external/cross-origin requests (Auth, Analytics, Fonts, APIs)
+  if (url.origin !== self.location.origin) {
+    return;
+  }
+
+  // 2. Network-first strategy for navigation / HTML routes (instant updates)
+  if (req.mode === 'navigate' || req.headers.get('accept')?.includes('text/html')) {
+    event.respondWith(
+      fetch(req)
+        .then((networkRes) => {
+          if (networkRes && networkRes.ok) {
+            const clone = networkRes.clone();
+            caches.open(CACHE_NAME).then((cache) => cache.put(req, clone));
+          }
+          return networkRes;
+        })
+        .catch(() => {
+          return caches.match(req).then((cached) => cached || caches.match('/index.html'));
+        })
+    );
+    return;
+  }
+
+  // 3. Stale-while-revalidate for same-origin static assets
+  event.respondWith(
+    caches.match(req).then((cached) => {
+      const fetchPromise = fetch(req)
+        .then((networkRes) => {
+          if (networkRes && networkRes.ok) {
+            const clone = networkRes.clone();
+            caches.open(CACHE_NAME).then((cache) => cache.put(req, clone));
+          }
+          return networkRes;
+        })
+        .catch(() => null);
+
+      return cached || fetchPromise;
+    })
+  );
+});