feat(laravel): auto-set APP_URL from platform or custom domain

Inject APP_URL for Laravel/PHP apps when missing: on create from the
platform subdomain, on custom-domain verification from the verified host,
and at deploy time as a safety net. Never overwrites user-provided values.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/applications/applications.service.ts

@@ -9,6 +9,7 @@ import { Application } from './entities/application.entity';
 import { CreateApplicationDto, UpdateApplicationDto } from './dto/application.dto';
 import { ClustersService } from '../clusters/clusters.service';
 import { UserRole, DatabaseType, CustomDomainStatus, AppRuntime } from '../common/enums';
+import { ensureAppUrlEnv } from './app-url.util';
 
 @Injectable()
 export class ApplicationsService {
@@ -82,6 +83,9 @@ export class ApplicationsService {
       ? 80
       : 3000;
 
+    const subdomain = `${dto.name}-${userId.split('-')[0]}`;
+    const platformDomain = this.configService.get('platform.domain') || 'apps.cloudhost.ir';
+
     const app = this.appsRepository.create({
       ...dto,
       userId,
@@ -90,9 +94,20 @@ export class ApplicationsService {
       dbUsername,
       dbPassword,
       port: dto.port ?? defaultPort,
-      subdomain: `${dto.name}-${userId.split('-')[0]}`,
+      subdomain,
       customDomain: customDomain || undefined,
       customDomainStatus: customDomain ? CustomDomainStatus.PENDING_DNS : CustomDomainStatus.NONE,
+      envVars: ensureAppUrlEnv(
+        {
+          name: dto.name,
+          runtime: dto.runtime,
+          subdomain,
+          customDomain: customDomain || undefined,
+          customDomainStatus: customDomain ? CustomDomainStatus.PENDING_DNS : CustomDomainStatus.NONE,
+          envVars: dto.envVars,
+        },
+        platformDomain,
+      ),
     });
     return this.appsRepository.save(app);
   }