[Module wiring] Wire WalletModule to cleanly import UsersModule and TypeOrmModule

[chillwur]

Description

Resolve module dependencies (WalletModule needs UsersService to validate userId, and the wallets TypeORM repository) without circular imports.

Deliverables

• WalletModule imports UsersModule (exporting UsersService) and registers the Wallet entity repository
• No circular dependency warnings on boot

Depends on

Persist the Wallet entity linked to a userId