getBalance/getStakeBalance always return '0', breaking wallet sync

[martinzhames]

Category: bug

Problem

src/blockchain-wallet/soroban.service.ts's getBalance/getStakeBalance (lines 210-217) are TODO stubs that return a hardcoded '0'. BlockchainWalletService.syncBalance() (src/blockchain-wallet/blockchain-wallet.service.ts lines 84-102) calls these and persists whatever they return.

Impact

GET /wallet/balance will always report balanceUsdc: '0'/stakedBalance: '0' in production regardless of the wallet's actual on-chain balance, making the wallet balance feature entirely non-functional for end users.

Suggested fix

Implement real Soroban contract reads for balance/stake, or clearly mark the endpoint as unavailable until implemented.

[lyon-1050]

@lyon-1050 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello team, can I work on this issue

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