Fix remaining issues: CDN config, min_staff_rank defaults, blade views

- Centralize all CDN URLs in config('habbo.cdn.*') with env overrides
- Replace hardcoded CDN URLs in 12+ blade views (fancybox, sweetalert2,
  alpinejs, fontsource, fontawesome, html2canvas)
- Fix font-awesome 7.0.0 (non-existent) -> config with 6.7.0 default
- Centralize all hardcoded min_staff_rank defaults (3 and 7) to config
- Add MIN_STAFF_RANK and MIN_STAFF_RANK_LOGIN env variables

resources/views/radio/embed.blade.php

@@ -4,7 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Radio Player</title>
-    <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script>
+    <script defer src="{{ config('habbo.cdn.alpine_js') }}"></script>
     <style>
         *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
         body {