fix: expose iOS home screen icons for web app

backend/bot/app/web/templates/subscription_webapp.html

@@ -8,7 +8,20 @@
     />
     <meta name="robots" content="noindex, nofollow" />
     <meta name="theme-color" content="#03070b" />
-    <link id="app-favicon" rel="icon" href="data:," sizes="any" />
+    <link id="app-favicon" rel="icon" href="/favicon.ico" sizes="any" />
+    <link rel="icon" type="image/png" sizes="192x192" href="/icon-192.png" />
+    <link rel="icon" type="image/png" sizes="512x512" href="/icon-512.png" />
+    <link
+      id="app-apple-touch-icon"
+      rel="apple-touch-icon"
+      sizes="180x180"
+      href="/apple-touch-icon.png"
+    />
+    <link
+      rel="apple-touch-icon-precomposed"
+      sizes="180x180"
+      href="/apple-touch-icon-precomposed.png"
+    />
     <title>/minishop</title>
     <link rel="stylesheet" href="/subscription_webapp.css" />
     <style>