seo: proper favicon sizes (32/192/512px) + web app manifest for Yandex

app/static/manifest.json

@@ -0,0 +1,11 @@
+{
+  "name": "Инфраструктурный полигон MONT",
+  "short_name": "MONT Полигон",
+  "description": "Демонстрация и пилотное тестирование российского ПО",
+  "start_url": "/",
+  "display": "browser",
+  "icons": [
+    { "src": "/static/favicon_192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "/static/favicon_512.png", "sizes": "512x512", "type": "image/png" }
+  ]
+}

app/templates/admin.html

@@ -7,7 +7,10 @@
   <link rel="stylesheet" href="/static/style.css?v=2" />
   <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
   <link rel="icon" type="image/svg+xml" href="/static/favicon.svg" />
-  <link rel="icon" type="image/png" href="/static/favicon.png" />
+  <link rel="icon" type="image/png" sizes="32x32" href="/static/favicon_32.png" />
+  <link rel="icon" type="image/png" sizes="192x192" href="/static/favicon_192.png" />
+  <link rel="apple-touch-icon" sizes="192x192" href="/static/favicon_192.png" />
+  <link rel="manifest" href="/static/manifest.json" />
 <!-- Yandex.Metrika counter -->
 <script type="text/javascript">
     (function(m,e,t,r,i,k,a){

app/templates/dashboard.html

@@ -7,7 +7,10 @@
   <link rel="stylesheet" href="/static/style.css?v=2" />
   <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
   <link rel="icon" type="image/svg+xml" href="/static/favicon.svg" />
-  <link rel="icon" type="image/png" href="/static/favicon.png" />
+  <link rel="icon" type="image/png" sizes="32x32" href="/static/favicon_32.png" />
+  <link rel="icon" type="image/png" sizes="192x192" href="/static/favicon_192.png" />
+  <link rel="apple-touch-icon" sizes="192x192" href="/static/favicon_192.png" />
+  <link rel="manifest" href="/static/manifest.json" />
 <!-- Yandex.Metrika counter -->
 <script type="text/javascript">
     (function(m,e,t,r,i,k,a){

app/templates/login.html

@@ -37,7 +37,10 @@
   <link rel="stylesheet" href="/static/style.css?v=2" />
   <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
   <link rel="icon" type="image/svg+xml" href="/static/favicon.svg" />
-  <link rel="icon" type="image/png" href="/static/favicon.png" />
+  <link rel="icon" type="image/png" sizes="32x32" href="/static/favicon_32.png" />
+  <link rel="icon" type="image/png" sizes="192x192" href="/static/favicon_192.png" />
+  <link rel="apple-touch-icon" sizes="192x192" href="/static/favicon_192.png" />
+  <link rel="manifest" href="/static/manifest.json" />
   <style>
     body { background: #070f1c; overflow: hidden; height: 100vh; }
     @media (max-width: 820px) { body { overflow: auto; height: auto; } }