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>

frontend/src/types/index.ts

@@ -39,11 +39,17 @@ export interface Application {
   poolId?: string;
   latestImageTag?: string;
   subdomain?: string;
+  customDomain?: string;
+  customDomainStatus?: 'none' | 'pending_dns' | 'verified';
+  customDomainVerifiedAt?: string;
   deployments?: Deployment[];
   // Optional services
   enableRedis?: boolean;
+  redisVersion?: string;
   enableRabbitmq?: boolean;
+  rabbitmqVersion?: string;
   enableElasticsearch?: boolean;
+  elasticsearchVersion?: string;
   logPaths?: string[];
   // Billing & Lifecycle
   planId?: string;
@@ -127,10 +133,14 @@ export interface CreateApplicationDto {
   port?: number;
   clusterId?: string;
   poolId?: string;
+  customDomain?: string;
   // Optional services
   enableRedis?: boolean;
+  redisVersion?: string;
   enableRabbitmq?: boolean;
+  rabbitmqVersion?: string;
   enableElasticsearch?: boolean;
+  elasticsearchVersion?: string;
   logPaths?: string[];
 }
 
@@ -263,7 +273,7 @@ export interface TicketStats {
 // ─── Billing types ──────────────────────────────────
 
 export type BillingCycle = 'hourly' | 'monthly' | 'yearly';
-export type PricingResourceType = 'base_fee' | 'cpu_per_core' | 'memory_per_gb' | 'storage_per_gb' | 'database_addon';
+export type PricingResourceType = 'base_fee' | 'cpu_per_core' | 'memory_per_gb' | 'storage_per_gb' | 'database_addon' | 'redis_addon' | 'rabbitmq_addon' | 'elasticsearch_addon' | 'custom_domain_addon';
 export type TransactionType = 'charge' | 'deduction' | 'refund';
 
 export interface PricingRule {