feat(wallet-service): Implement complete wallet service with DDD architecture
- Add domain layer with aggregates (WalletAccount, LedgerEntry, DepositOrder, SettlementOrder)
- Add value objects (Money, Balance, Hashpower, UserId, etc.)
- Add domain events for event-driven architecture
- Implement application layer with CQRS commands and queries
- Add infrastructure layer with Prisma repositories
- Implement REST API with NestJS controllers
- Add JWT authentication with guards and strategies
- Add comprehensive unit tests (69 tests) and E2E tests (23 tests)
- Add documentation: ARCHITECTURE.md, API.md, DEVELOPMENT.md, TESTING.md, DEPLOYMENT.md
- Add E2E testing guide for WSL2 environment
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Co-Authored-By: Claude <noreply@anthropic.com>
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