Replace free TURN with self-hosted coturn; fix Safari connectivity; release v5.4.10

- config/ice-servers.prod.js: swap ExpressTURN for self-hosted coturn at
  turn.securebit.chat (TURN udp/tcp on 3478, TURNS/TLS on 443). Long-lived
  REST-API credential (expiry capped at int32 max for coturn compatibility).
- Add raw-IP STUN/TURN fallback (144.172.96.126): Safari's WebRTC layer fails
  to resolve STUN/TURN hostnames on some networks and gathers no srflx/relay
  candidates; reaching the server by IP fixes cross-browser (Safari<->Chrome)
  connections. Harmless to other browsers.
- deploy/nginx.conf: never long-cache /config/ice-servers.js so clients don't
  lock onto a stale server list.
- Bump version to 5.4.10 (header + init banner).

index.html

@@ -23,7 +23,7 @@
 
     <!-- PWA Manifest -->
 <link rel="manifest" href="./manifest.json">
-<link rel="icon" type="image/x-icon" href="./logo/favicon.ico?v=1784694927450">
+<link rel="icon" type="image/x-icon" href="./logo/favicon.ico?v=1784757947117">
 
 <!-- PWA Meta Tags -->
 <meta name="mobile-web-app-capable" content="yes">
@@ -89,7 +89,7 @@
     <link rel="apple-touch-startup-image" media="screen and (device-width: 744px) and (device-height: 1133px) and (-webkit-device-pixel-ratio: 2) and (orientation: portrait)" href="./logo/splash/splash_screens/8.3__iPad_Mini_portrait.png">
     
 <!-- Apple Touch Icons -->
-<link rel="apple-touch-icon" href="./logo/icon-180x180.png?v=1784694927450">
+<link rel="apple-touch-icon" href="./logo/icon-180x180.png?v=1784757947117">
 <link rel="apple-touch-icon" sizes="57x57" href="./logo/icon-57x57.png">
 <link rel="apple-touch-icon" sizes="60x60" href="./logo/icon-60x60.png">
 <link rel="apple-touch-icon" sizes="72x72" href="./logo/icon-72x72.png">
@@ -98,7 +98,7 @@
 <link rel="apple-touch-icon" sizes="120x120" href="./logo/icon-120x120.png">
 <link rel="apple-touch-icon" sizes="144x144" href="./logo/icon-144x144.png">
 <link rel="apple-touch-icon" sizes="152x152" href="./logo/icon-152x152.png">
-<link rel="apple-touch-icon" sizes="180x180" href="./logo/icon-180x180.png?v=1784694927450">
+<link rel="apple-touch-icon" sizes="180x180" href="./logo/icon-180x180.png?v=1784757947117">
 
 <!-- Microsoft Tiles -->
 <meta name="msapplication-TileColor" content="#ff6b35">
@@ -182,7 +182,7 @@
     <!-- Render-blocking JS is deferred: classic deferred scripts and module scripts
          both execute in document order after parsing, so React still runs before the
          app modules below, but the parser / first paint is no longer blocked. -->
-    <script defer src="config/ice-servers.js"></script>
+    <script defer src="config/ice-servers.js?v=1784757947117"></script>
     <script defer src="libs/react/react.production.min.js"></script>
     <script defer src="libs/react-dom/react-dom.production.min.js"></script>
     <!-- Prism syntax highlighting (vendored, offline). Tokenizes code as TEXT only —
@@ -190,8 +190,8 @@
          Its CSS is loaded async via load-async-css.js (not paint-critical). -->
     <script defer src="libs/prism/prism.js"></script>
     <!-- Critical, paint-defining CSS stays render-blocking (avoids FOUC / layout shift). -->
-    <link rel="stylesheet" href="assets/tailwind.css?v=1784694927450">
-    <link rel="icon" type="image/x-icon" href="/logo/favicon.ico?v=1784694927450">
+    <link rel="stylesheet" href="assets/tailwind.css?v=1784757947117">
+    <link rel="icon" type="image/x-icon" href="/logo/favicon.ico?v=1784757947117">
     <!-- Preload only the fonts needed for first paint. fa-solid covers the bulk of UI
          icons; fa-regular/fa-brands are loaded on demand by their CSS (rarely on the
          first screen). Inter latin 400/700 cover body text and headings/buttons. -->
@@ -199,31 +199,31 @@
     <link rel="preload" href="/assets/fonts/inter/files/inter-latin-400.woff2" as="font" type="font/woff2" crossorigin>
     <link rel="preload" href="/assets/fonts/inter/files/inter-latin-700.woff2" as="font" type="font/woff2" crossorigin>
     <link rel="stylesheet" href="/assets/fonts/inter/inter.css">
-    <link rel="stylesheet" href="src/styles/main.css?v=1784694927450">
-    <link rel="stylesheet" href="src/styles/animations.css?v=1784694927450">
-    <link rel="stylesheet" href="src/styles/components.css?v=1784694927450">
+    <link rel="stylesheet" href="src/styles/main.css?v=1784757947117">
+    <link rel="stylesheet" href="src/styles/animations.css?v=1784757947117">
+    <link rel="stylesheet" href="src/styles/components.css?v=1784757947117">
     <!-- Non-critical CSS (FontAwesome ~102KB, Prism) loaded async — no longer blocks paint. -->
-    <script defer src="src/scripts/load-async-css.js?v=1784694927450"></script>
+    <script defer src="src/scripts/load-async-css.js?v=1784757947117"></script>
     <noscript>
         <link rel="stylesheet" href="/assets/fontawesome/css/all.min.css">
         <link rel="stylesheet" href="libs/prism/prism.css">
     </noscript>
-    <script defer src="src/scripts/fa-check.js?v=1784694927450"></script>
+    <script defer src="src/scripts/fa-check.js?v=1784757947117"></script>
     <!-- Update Manager - система принудительного обновления -->
-    <script defer src="src/utils/updateManager.js?v=1784694927450"></script>
-    <script type="module" src="src/components/UpdateChecker.jsx?v=1784694927450"></script>
-    <script type="module" src="dist/qr-local.js?v=1784694927450"></script>
-    <script type="module" src="src/components/QRScanner.js?v=1784694927450"></script>
+    <script defer src="src/utils/updateManager.js?v=1784757947117"></script>
+    <script type="module" src="src/components/UpdateChecker.jsx?v=1784757947117"></script>
+    <script type="module" src="dist/qr-local.js?v=1784757947117"></script>
+    <script type="module" src="src/components/QRScanner.js?v=1784757947117"></script>
 </head>
 <body>
     <div id="root"></div>
-    <script type="module" src="dist/app-boot.js?v=1784694927450"></script>
-    <script type="module" src="dist/app.js?v=1784694927450"></script>
+    <script type="module" src="dist/app-boot.js?v=1784757947117"></script>
+    <script type="module" src="dist/app.js?v=1784757947117"></script>
 
-<script defer src="src/scripts/pwa-register.js?v=1784694927450"></script>
-<script src="./src/pwa/install-prompt.js?v=1784694927450" type="module"></script>
-<script src="./src/pwa/pwa-manager.js?v=1784694927450" type="module"></script>
-<script defer src="./src/scripts/pwa-offline-test.js?v=1784694927450"></script>
-<link rel="stylesheet" href="./src/styles/pwa.css?v=1784694927450">
+<script defer src="src/scripts/pwa-register.js?v=1784757947117"></script>
+<script src="./src/pwa/install-prompt.js?v=1784757947117" type="module"></script>
+<script src="./src/pwa/pwa-manager.js?v=1784757947117" type="module"></script>
+<script defer src="./src/scripts/pwa-offline-test.js?v=1784757947117"></script>
+<link rel="stylesheet" href="./src/styles/pwa.css?v=1784757947117">
 </body>
 </html>