feat: initial JaniChat messenger — PWA, WebSocket, admin panel

frontend/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "name": "JaniChat",
+  "short_name": "JaniChat",
+  "description": "Корпоративный мессенджер",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#3b82f6",
+  "orientation": "portrait-primary",
+  "icons": [
+    {
+      "src": "/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ],
+  "categories": ["productivity", "business"]
+}

frontend/public/sw.js

@@ -0,0 +1,58 @@
+const CACHE_NAME = 'janichat-v1';
+const STATIC_ASSETS = ['/', '/index.html'];
+
+self.addEventListener('install', (event) => {
+  self.skipWaiting();
+  event.waitUntil(
+    caches.open(CACHE_NAME).then(cache => cache.addAll(STATIC_ASSETS).catch(() => {}))
+  );
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then(keys =>
+      Promise.all(keys.filter(k => k !== CACHE_NAME).map(k => caches.delete(k)))
+    )
+  );
+  self.clients.claim();
+});
+
+self.addEventListener('fetch', (event) => {
+  if (event.request.url.includes('/api/') || event.request.url.includes('/ws')) return;
+  event.respondWith(
+    fetch(event.request).catch(() => caches.match(event.request))
+  );
+});
+
+self.addEventListener('push', (event) => {
+  let data = { title: 'JaniChat', body: 'Новое сообщение', chatId: null };
+  try { data = event.data.json(); } catch {}
+
+  event.waitUntil(
+    self.registration.showNotification(data.title, {
+      body: data.body,
+      icon: '/icon-192.png',
+      badge: '/icon-192.png',
+      data: { chatId: data.chatId },
+      vibrate: [200, 100, 200],
+    })
+  );
+});
+
+self.addEventListener('notificationclick', (event) => {
+  event.notification.close();
+  const chatId = event.notification.data?.chatId;
+  const url = chatId ? `/?chat=${chatId}` : '/';
+
+  event.waitUntil(
+    self.clients.matchAll({ type: 'window', includeUncontrolled: true }).then(clients => {
+      for (const client of clients) {
+        if (client.url.includes(self.location.origin) && 'focus' in client) {
+          client.postMessage({ type: 'open_chat', chatId });
+          return client.focus();
+        }
+      }
+      return self.clients.openWindow(url);
+    })
+  );
+});