Panel redesign, per-server I1 masking, node minimum version 0.5.0, installer output

- UI: settings tab with sections (server, API keys, Prometheus, audit, migrate,
  about); server settings moved there; master keys table rework (menu, chips,
  version, compact phone cards); three-state node version chip
- I1: random per-server template (DNS / QUIC Initial / STUN) kept in users.db,
  GET/POST /api/masking, change from the master keys banner
- Hub rejects nodes older than 0.5.0 (close 4026), /ui/nodes reports outdated
- install.sh: spinner for long commands (full output in the log), step progress
  bar, cards; installs older than 0.5.0 require a full reinstall with data reset
- Bump to Beta 0.5.0

awg-ui/vite.config.ts

@@ -4,6 +4,8 @@
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
 
+const api = `http://localhost:${process.env.MOCK_PORT || 8080}`;
+
 export default defineConfig({
     // Ресурсы — от адреса страницы, а не от корня домена: собранная панель работает и в корне, и в
     // подпапке за reverse-proxy (example.com/forgetting/) без пересборки. Запросы к API — так же
@@ -12,11 +14,11 @@ export default defineConfig({
     plugins: [react()],
     server: {
         proxy: {
-            '/api':    'http://localhost:8080',
-            '/ui':     'http://localhost:8080',
-            '/health': 'http://localhost:8080',
-            '/login':  'http://localhost:8080',
-            '/logout': 'http://localhost:8080',
+            '/api':    api,
+            '/ui':     api,
+            '/health': api,
+            '/login':  api,
+            '/logout': api,
         },
     },
 });