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- Add notifications across all channels (Email, Discord, Slack, Telegram, Pushover, Webhook) for outdated versions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

database/seeders/ProductionSeeder.php

@@ -113,6 +113,8 @@ class ProductionSeeder extends Seeder
                 $server_details['proxy'] = ServerMetadata::from([
                     'type' => ProxyTypes::TRAEFIK->value,
                     'status' => ProxyStatus::EXITED->value,
+                    'last_saved_settings' => null,
+                    'last_applied_settings' => null,
                 ]);
                 $server = Server::create($server_details);
                 $server->settings->is_reachable = true;
@@ -177,6 +179,8 @@ uZx9iFkCELtxrh31QJ68AAAAEXNhaWxANzZmZjY2ZDJlMmRkAQIDBA==
                 $server_details['proxy'] = ServerMetadata::from([
                     'type' => ProxyTypes::TRAEFIK->value,
                     'status' => ProxyStatus::EXITED->value,
+                    'last_saved_settings' => null,
+                    'last_applied_settings' => null,
                 ]);
                 $server = Server::create($server_details);
                 $server->settings->is_reachable = true;