fix: resolve circular import errors in TypeORM entities

- Use string-based @OneToMany relations in parent entities (wallet, ticket, service-plan)
  to break circular import chains that confused VS Code TS language server
- Add .vscode/settings.json to suppress Tailwind CSS @tailwindcss unknownAtRules warnings
- Reorder imports in child entities for consistency

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "css.customData": [],
+  "css.lint.unknownAtRules": "ignore",
+  "scss.lint.unknownAtRules": "ignore"
+}

backend/src/billing/entities/pricing-rule.entity.ts

@@ -6,8 +6,8 @@ import {
   JoinColumn,
   CreateDateColumn,
 } from 'typeorm';
-import { PricingResourceType } from '../../common/enums';
 import { ServicePlan } from './service-plan.entity';
+import { PricingResourceType } from '../../common/enums';
 
 @Entity('pricing_rules')
 export class PricingRule {

backend/src/billing/entities/service-plan.entity.ts

@@ -7,7 +7,6 @@ import {
   OneToMany,
 } from 'typeorm';
 import { BillingCycle, AppRuntime } from '../../common/enums';
-import { PricingRule } from './pricing-rule.entity';
 
 @Entity('service_plans')
 export class ServicePlan {
@@ -29,8 +28,8 @@ export class ServicePlan {
   @Column({ default: true })
   isActive: boolean;
 
-  @OneToMany(() => PricingRule, (rule) => rule.plan, { cascade: true, eager: true })
-  pricingRules: PricingRule[];
+  @OneToMany('PricingRule', 'plan', { cascade: true, eager: true })
+  pricingRules: any[];
 
   @CreateDateColumn()
   createdAt: Date;

backend/src/billing/entities/wallet-transaction.entity.ts

@@ -6,8 +6,8 @@ import {
   JoinColumn,
   CreateDateColumn,
 } from 'typeorm';
-import { TransactionType } from '../../common/enums';
 import { Wallet } from './wallet.entity';
+import { TransactionType } from '../../common/enums';
 
 @Entity('wallet_transactions')
 export class WalletTransaction {

backend/src/billing/entities/wallet.entity.ts

@@ -9,7 +9,6 @@ import {
   OneToMany,
 } from 'typeorm';
 import { User } from '../../users/entities/user.entity';
-import { WalletTransaction } from './wallet-transaction.entity';
 
 @Entity('wallets')
 export class Wallet {
@@ -26,8 +25,8 @@ export class Wallet {
   @Column({ unique: true })
   userId: string;
 
-  @OneToMany(() => WalletTransaction, (tx: WalletTransaction) => tx.wallet)
-  transactions: WalletTransaction[];
+  @OneToMany('WalletTransaction', 'wallet')
+  transactions: any[];
 
   @CreateDateColumn()
   createdAt: Date;

backend/src/tickets/entities/ticket-message.entity.ts

@@ -6,9 +6,9 @@ import {
   ManyToOne,
   JoinColumn,
 } from 'typeorm';
-import { Ticket } from './ticket.entity';
 import { User } from '../../users/entities/user.entity';
 import { UserRole } from '../../common/enums';
+import { Ticket } from './ticket.entity';
 
 @Entity('ticket_messages')
 export class TicketMessage {

backend/src/tickets/entities/ticket.entity.ts

@@ -10,7 +10,6 @@ import {
 } from 'typeorm';
 import { TicketDepartment, TicketStatus, TicketPriority } from '../../common/enums';
 import { User } from '../../users/entities/user.entity';
-import { TicketMessage } from './ticket-message.entity';
 
 @Entity('tickets')
 export class Ticket {
@@ -36,8 +35,8 @@ export class Ticket {
   @JoinColumn({ name: 'userId' })
   user: User;
 
-  @OneToMany(() => TicketMessage, (msg) => msg.ticket, { cascade: true })
-  messages: TicketMessage[];
+  @OneToMany('TicketMessage', 'ticket', { cascade: true })
+  messages: any[];
 
   @CreateDateColumn()
   createdAt: Date;