fix(proxy): set Traefik network labels for compose services

Add the Coolify network label when no user-selected Traefik network exists, while preserving custom labels for applications and services.

tests/Feature/TraefikServiceDockerNetworkLabelTest.php

@@ -0,0 +1,49 @@
+<?php
+
+use App\Models\Environment;
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\Service;
+use App\Models\ServiceApplication;
+use App\Models\StandaloneDocker;
+use App\Models\Team;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Bus;
+
+uses(RefreshDatabase::class);
+
+it('selects the Coolify service network for Traefik routed compose services', function () {
+    Bus::fake();
+
+    $team = Team::factory()->create();
+    $server = Server::factory()->create(['team_id' => $team->id]);
+    $destination = StandaloneDocker::where('server_id', $server->id)->firstOrFail();
+    $project = Project::factory()->create(['team_id' => $team->id]);
+    $environment = Environment::factory()->create(['project_id' => $project->id]);
+    $service = Service::factory()->create([
+        'environment_id' => $environment->id,
+        'server_id' => $server->id,
+        'destination_id' => $destination->id,
+        'destination_type' => $destination->getMorphClass(),
+        'docker_compose_raw' => <<<'YAML'
+services:
+  app:
+    image: nginx:latest
+    networks:
+      - custom-network
+networks:
+  custom-network: {}
+YAML,
+    ]);
+
+    ServiceApplication::create([
+        'name' => 'app',
+        'service_id' => $service->id,
+        'fqdn' => 'https://example.com',
+    ]);
+
+    $parsedCompose = serviceParser($service);
+    $labels = collect(data_get($parsedCompose, 'services.app.labels'));
+
+    expect($labels->values()->all())->toContain("traefik.docker.network={$service->uuid}");
+});