feat: add modular lending connector (vesu first)

[robertkodra]

Summary

• add a new modular lending module with protocol provider abstraction
• implement initial Vesu provider (market discovery + tx builders + position/health reads)
• wire lending client into wallet and tx builder (lendDeposit, lendWithdraw, lendBorrow, lendRepay)
• add lending unit tests and live paymaster smoke test scaffold

Validation

• npm run -s typecheck
• npm run -s lint
• npm run -s test -- tests/lending-vesu-provider.test.ts tests/lending-wallet.test.ts tests/tx-builder.test.ts

Linked Issue

• Related: Add modular lending connector (Vesu first) robertkodra/starkzap#1

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