fix(wallet-service): fix system-withdrawal API route prefix to match Kong gateway

Changed controller route from 'system-withdrawal' to 'wallets/system-withdrawal'
to align with Kong's /api/v1/wallets/* routing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/wallet-service/src/api/controllers/system-withdrawal.controller.ts

@@ -39,7 +39,7 @@ class SystemWithdrawalRequestDTO {
  * 供管理后台调用，用于从系统账户转出资金到用户账户
  */
 @ApiTags('System Withdrawal (Internal)')
-@Controller('system-withdrawal')
+@Controller('wallets/system-withdrawal')
 export class SystemWithdrawalController {
   private readonly logger = new Logger(SystemWithdrawalController.name);