feat: add carrot-deposit feature

[ChiefWoods]

Summary

Changes

• prerequisite: feat: add extra data to Deposit trait #32, feat: add remaining accounts for Deposit trait #40
• add carrot-deposit feature
• scaffold test (just like Jupiter and Kamino)

Testing

• make format
• make clippy
• make test
• make test-upstream (if relevant)

Protocol integration checklist (if applicable)

• Feature flag added and used for all protocol code
• Action context enums updated
• Detection logic updated
• Account parsing validates count and types
• Tests added or updated

[L0STE]

deposit_signed takes remaining_accounts: &[AccountView] as a function parameter — this breaks the Deposit trait signature and won't compile.

The right pattern is what Drift does in #33: capture remaining accounts in the struct via TryFrom, not as a function arg. The context router already passes the full account slice to your TryFrom, so you get them for free:

let [clend_program, clend_group, clend_account, signer, bank,
     signer_token_account, bank_liquidity_vault, token_program,
     remaining_accounts @ ..] = accounts

Then read ctx.remaining_accounts inside deposit_signed. Your push! macro CPI logic is fine — just rewire it.

Rebase onto #33 once it lands.