feat(proxy): add Traefik version tracking with notifications and dismissible UI warnings

- Add automated Traefik version checking job running weekly on Sundays
- Implement version detection from running containers and comparison with versions.json
- Add notifications across all channels (Email, Discord, Slack, Telegram, Pushover, Webhook) for outdated versions
- Create dismissible callout component with localStorage persistence
- Display cross-branch upgrade warnings (e.g., v3.5 -> v3.6) with changelog links
- Show patch update notifications within same branch
- Add warning icon that appears when callouts are dismissed
- Prevent duplicate notifications during proxy restart by adding restarting parameter
- Fix notification spam with transition-based logic for status changes
- Enable system email settings by default in development mode
- Track last saved/applied proxy settings to detect configuration drift

resources/views/emails/traefik-version-outdated.blade.php

@@ -0,0 +1,43 @@
+<x-emails.layout>
+{{ $count }} server(s) are running outdated Traefik proxy. Update recommended for security and features.
+
+**Note:** This check is based on the actual running container version, not the configuration file.
+
+## Affected Servers
+
+@foreach ($servers as $server)
+@php
+    $info = $server->outdatedInfo ?? [];
+    $current = $info['current'] ?? 'unknown';
+    $latest = $info['latest'] ?? 'unknown';
+    $type = ($info['type'] ?? 'patch_update') === 'patch_update' ? '(patch)' : '(upgrade)';
+    $hasUpgrades = $hasUpgrades ?? false;
+    if ($type === 'upgrade') {
+        $hasUpgrades = true;
+    }
+    // Add 'v' prefix for display
+    $current = str_starts_with($current, 'v') ? $current : "v{$current}";
+    $latest = str_starts_with($latest, 'v') ? $latest : "v{$latest}";
+@endphp
+- **{{ $server->name }}**: {{ $current }} → {{ $latest }} {{ $type }}
+@endforeach
+
+## Recommendation
+
+It is recommended to test the new Traefik version before switching it in production environments. You can update your proxy configuration through your [Coolify Dashboard]({{ config('app.url') }}).
+
+@if ($hasUpgrades ?? false)
+**Important for major/minor upgrades:** Before upgrading to a new major or minor version, please read the [Traefik changelog](https://github.com/traefik/traefik/releases) to understand breaking changes and new features.
+@endif
+
+## Next Steps
+
+1. Review the [Traefik release notes](https://github.com/traefik/traefik/releases) for changes
+2. Test the new version in a non-production environment
+3. Update your proxy configuration when ready
+4. Monitor services after the update
+
+---
+
+You can manage your server proxy settings in your Coolify Dashboard.
+</x-emails.layout>