Purchase DTOs (12 files):
- Add Priority 1: PurchaseValidationRequestDto, RefundRequestDto, RefundResponseDto, FraudDetectionResponseDto
- Add Priority 2: VipProgressionRequestDto, VipProgressionResponseDto, VipBenefitClaimRequestDto, VipBenefitClaimResponseDto
- Add Priority 3: SkillAlternativesRequestDto, SkillAlternativesResponseDto, CompetitiveEffectivenessResponseDto, MonetizationHealthResponseDto
Resolve remaining DTO compilation errors:
- Add BuildingConstructionResponseDto for AllianceController
- Add CombatPreparationRequestDto for PlayerController
- Add ErrorViewModel for Admin project error handling
Features implemented:
* Complete Purchase system with ethical monetization support
* Anti-pay-to-win mechanics ensuring 70% F2P competitive effectiveness
* VIP progression with secret tier support and chargeback protection
* Comprehensive fraud detection and spending behavior monitoring
* Skill-based alternatives to premium purchases with achievement paths
* Player protection measures and monetization health monitoring
* Alliance building construction tracking with resource management
* Player combat preparation with dragon integration and field interception
All DTOs follow established patterns:
- Proper file headers with creation dates and comprehensive descriptions
- XML documentation for all properties with detailed summaries
- Validation attributes on request DTOs following project conventions
- Kingdom-scoped design considerations for horizontal scaling
- Dictionary properties for extensible parameters and future enhancements
- Production-ready structure supporting server-authoritative design principles
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