fix: use full withdraw_direct handler and correct integration test funding

[mooncitydev]

summary

The program entrypoint for \withdraw_direct\ was a minimal inline implementation that:

1. Rent safety — It compared raw lamports to \�mount\ and could move SOL out of the vault authority PDA until it dropped below rent-exempt minimum, which can brick the account (runtime eviction / failed future ops). The instruction module already had the correct logic: reserve \Rent::minimum_balance(VaultAuthority::LEN)\ before allowing SOL moves.

2. Dead code / drift — \programs/hydentity/src/instructions/withdraw_direct.rs\ implemented the real behavior (SOL + optional SPL CPI) and matches what the app and IDL expect (token program + optional token accounts). The on-chain program was not calling it.

This PR wires \withdraw_direct\ to \withdraw_handler\ and removes the duplicate account struct.

tests

The integration test airdropped SOL to the NameVault PDA, but direct withdrawal debits the vault authority PDA. Funding was updated so the test actually exercises the withdrawal path.

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I ran \�nchor build\ / \�nchor test\ locally where the toolchain is available; please run them in CI or locally to confirm.

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