feat: add PWA support - manifest, service worker, offline page, icons

public/manifest.json

@@ -0,0 +1,26 @@
+{
+  "name": "ServerManager",
+  "short_name": "SM",
+  "description": "Linux Server Management Platform",
+  "start_url": "/dashboard",
+  "display": "standalone",
+  "background_color": "#0f1117",
+  "theme_color": "#6366f1",
+  "categories": ["productivity", "utilities"],
+  "lang": "en",
+  "orientation": "any",
+  "icons": [
+    {
+      "src": "/assets/img/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/assets/img/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ]
+}