feat: add custom domain support with SSL, DNS verification, and billing

Users can assign a custom domain to their app with automatic SSL via
cert-manager. Includes DNS verification flow (CNAME check), Persian
instructions, admin-configurable pricing via PlatformSetting, and
integration into the deploy wizard cost calculation.

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

backend/src/applications/entities/application.entity.ts

@@ -8,7 +8,7 @@ import {
   OneToMany,
   JoinColumn,
 } from 'typeorm';
-import { AppRuntime, DatabaseType, BillingCycle, AppLifecycleStatus } from '../../common/enums';
+import { AppRuntime, DatabaseType, BillingCycle, AppLifecycleStatus, CustomDomainStatus } from '../../common/enums';
 import { User } from '../../users/entities/user.entity';
 import { Deployment } from '../../deployments/entities/deployment.entity';
 
@@ -54,12 +54,21 @@ export class Application {
   @Column({ default: false })
   enableRedis: boolean;
 
+  @Column({ nullable: true, default: '7.2' })
+  redisVersion: string;
+
   @Column({ default: false })
   enableRabbitmq: boolean;
 
+  @Column({ nullable: true, default: '3.13' })
+  rabbitmqVersion: string;
+
   @Column({ default: false })
   enableElasticsearch: boolean; // For application logging
 
+  @Column({ nullable: true, default: '8.12' })
+  elasticsearchVersion: string;
+
   @Column({ type: 'jsonb', nullable: true })
   logPaths: string[]; // Custom log paths to collect (e.g., ['/app/logs/*.log'])
 
@@ -124,6 +133,16 @@ export class Application {
   @Column({ nullable: true })
   subdomain: string; // <subdomain>.apps.cloudhost.local
 
+  // ── Custom Domain ─────────────────────────────
+  @Column({ nullable: true })
+  customDomain?: string; // e.g. "www.example.com"
+
+  @Column({ type: 'enum', enum: CustomDomainStatus, default: CustomDomainStatus.NONE })
+  customDomainStatus: CustomDomainStatus;
+
+  @Column({ type: 'timestamptz', nullable: true })
+  customDomainVerifiedAt?: Date;
+
   // ── Billing & Lifecycle ─────────────────────────────
   @Column({ nullable: true })
   planId: string; // FK to ServicePlan