initialize Electron desktop app and remove unused files

packages/client/public/manifest.webmanifest

@@ -0,0 +1,18 @@
+{
+  "name": "hermes-ui",
+  "short_name": "hermes-ui",
+  "description": "Self-hosted web dashboard for Hermes Agent",
+  "start_url": "/#/hermes/chat",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#f7f7f4",
+  "theme_color": "#f7f7f4",
+  "icons": [
+    {
+      "src": "/logo.png",
+      "sizes": "1254x1254",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ]
+}

packages/client/public/notification-sw.js

@@ -0,0 +1,10 @@
+self.addEventListener('notificationclick', (event) => {
+  event.notification.close()
+  event.waitUntil((async () => {
+    const windows = await clients.matchAll({ type: 'window', includeUncontrolled: true })
+    for (const client of windows) {
+      if ('focus' in client) return client.focus()
+    }
+    if (clients.openWindow) return clients.openWindow('/')
+  })())
+})