chore: Implement VedaAdapter

[MoMannn]

What?

• Adds VedaAdapter.sol — a new adapter contract for delegation-based deposits and withdrawals on Veda BoringVault
• Adds IVedaTeller.sol — minimal interface for Veda's TellerWithMultiAssetSupport
• Adds VedaLending.t.sol — comprehensive test suite (fork tests, happy paths, input validation, events, batch operations, edge cases, 3-level delegation chain)

Why?

• Enables users to deposit into and withdraw from Veda BoringVaults through the delegation framework, without requiring direct token approvals
• Allows operators to execute vault operations on behalf of users via the redelegation pattern, with fine-grained control over tokens, amounts, and who can redeem

How?

• Uses the redelegation pattern (user → operator → adapter) consistent with DelegationMetaSwapAdapter
• On deposit: redeems the delegation chain to transfer tokens to the adapter, approves the BoringVault, and calls teller.bulkDeposit() to mint shares directly to the root delegator
• On withdraw: redeems the delegation chain to transfer vault shares to the adapter, then calls teller.withdraw() to burn shares and send underlying assets to the root delegator
• Supports batched operations via depositByDelegationBatch / withdrawByDelegationBatch
• Includes withdrawEmergency (owner-only) for recovering tokens accidentally sent to the contract

Note

• Tests run against a forked Ink mainnet — add INK_RPC_URL=https://ink.drpc.org to your .env
• Tests are failing in CI because env is not set

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Note

Medium Risk
Adds a new on-chain adapter that redeems delegations to move ERC20s/vault shares and manage approvals before calling into an external Teller/Vault, so bugs could directly impact user funds despite extensive fork-based tests.

Overview
Adds a new VedaAdapter contract that redeems delegation chains to execute Veda BoringVault deposits (token transfer → bulkDeposit minting shares to the root delegator) and withdrawals (share transfer → withdraw sending assets to the root delegator), including batch variants and an owner-only withdrawEmergency token recovery path.

Introduces IVedaTeller as a minimal interface for the required Teller entrypoints and adds VedaLending.t.sol fork tests covering happy paths, input validation/reverts, event emission, batching, allowance behavior, and multi-level delegation-chain resolution.

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