feat(pwa): make Mila app installable with PWA manifest, service worker and high-res icons

skills/datastore/assets/sw.js

@@ -0,0 +1,26 @@
+// Minimal service worker for Mila PWA installability & offline resilience
+const CACHE_NAME = 'mila-v1';
+
+self.addEventListener('install', (event) => {
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((keys) =>
+      Promise.all(
+        keys.map((key) => {
+          if (key !== CACHE_NAME) return caches.delete(key);
+        })
+      )
+    ).then(() => self.clients.claim())
+  );
+});
+
+self.addEventListener('fetch', (event) => {
+  if (event.request.method !== 'GET') return;
+  // Network-first strategy: Always fetch live real-time updates from MinIO
+  event.respondWith(
+    fetch(event.request).catch(() => caches.match(event.request))
+  );
+});