feat(proxy): validate stored config matches current proxy type

Add validation in GetProxyConfiguration to detect when stored proxy config
belongs to a different proxy type (e.g., Traefik config on a Caddy server)
and trigger regeneration with a warning log. Clear cached proxy configuration
and settings when proxy type is changed to prevent stale configs from being
reused. Includes tests verifying config rejection on type mismatch and
graceful fallback on invalid YAML.

app/Actions/Proxy/GetProxyConfiguration.php

@@ -2,10 +2,12 @@
 
 namespace App\Actions\Proxy;
 
+use App\Enums\ProxyTypes;
 use App\Models\Server;
 use App\Services\ProxyDashboardCacheService;
 use Illuminate\Support\Facades\Log;
 use Lorisleiva\Actions\Concerns\AsAction;
+use Symfony\Component\Yaml\Yaml;
 
 class GetProxyConfiguration
 {
@@ -24,6 +26,17 @@ class GetProxyConfiguration
             // Primary source: database
             $proxy_configuration = $server->proxy->get('last_saved_proxy_configuration');
 
+            // Validate stored config matches current proxy type
+            if (! empty(trim($proxy_configuration ?? ''))) {
+                if (! $this->configMatchesProxyType($proxyType, $proxy_configuration)) {
+                    Log::warning('Stored proxy config does not match current proxy type, will regenerate', [
+                        'server_id' => $server->id,
+                        'proxy_type' => $proxyType,
+                    ]);
+                    $proxy_configuration = null;
+                }
+            }
+
             // Backfill: existing servers may not have DB config yet — read from disk once
             if (empty(trim($proxy_configuration ?? ''))) {
                 $proxy_configuration = $this->backfillFromDisk($server);
@@ -55,6 +68,29 @@ class GetProxyConfiguration
         return $proxy_configuration;
     }
 
+    /**
+     * Check that the stored docker-compose YAML contains the expected service
+     * for the server's current proxy type. Returns false if the config belongs
+     * to a different proxy type (e.g. Traefik config on a CADDY server).
+     */
+    private function configMatchesProxyType(string $proxyType, string $configuration): bool
+    {
+        try {
+            $yaml = Yaml::parse($configuration);
+            $services = data_get($yaml, 'services', []);
+
+            return match ($proxyType) {
+                ProxyTypes::TRAEFIK->value => isset($services['traefik']),
+                ProxyTypes::CADDY->value => isset($services['caddy']),
+                ProxyTypes::NGINX->value => isset($services['nginx']),
+                default => true,
+            };
+        } catch (\Throwable $e) {
+            // If YAML is unparseable, don't block — let the existing flow handle it
+            return true;
+        }
+    }
+
     /**
      * Backfill: read config from disk for servers that predate DB storage.
      * Stores the result in the database so future reads skip SSH entirely.