fix(api): remove deprecated docker compose application endpoint

Drop the unstable applications/dockercompose route and controller path now that
service creation is handled by POST /api/v1/services. Add coverage to ensure the
deprecated endpoint stays unregistered while the services endpoint remains
available.

tests/Feature/DeprecatedDockerComposeApplicationEndpointTest.php

@@ -0,0 +1,22 @@
+<?php
+
+use App\Http\Controllers\Api\ServicesController;
+use Illuminate\Support\Facades\Route;
+
+test('deprecated docker compose application endpoint is not registered', function () {
+    $routes = collect(Route::getRoutes()->getRoutes())
+        ->filter(fn ($route) => in_array('POST', $route->methods(), true))
+        ->filter(fn ($route) => $route->uri() === 'api/v1/applications/dockercompose');
+
+    expect($routes)->toBeEmpty();
+
+    $this->postJson('/api/v1/applications/dockercompose')->assertNotFound();
+});
+
+test('custom docker compose services endpoint remains registered', function () {
+    $route = collect(Route::getRoutes()->getRoutes())
+        ->first(fn ($route) => in_array('POST', $route->methods(), true) && $route->uri() === 'api/v1/services');
+
+    expect($route)->not->toBeNull()
+        ->and($route->getActionName())->toBe(ServicesController::class.'@create_service');
+});