approve set and all on-chain commands ignore --signature-type proxy, send txs from EOA

[qtzx06]

--signature-type proxy ignored for on-chain txs (approve, ctf), txs go from eoa

repro

1. polymarket wallet create (gets eoa + proxy)
2. set signature_type = proxy
3. deposit usdc to proxy
4. run polymarket approve set
5. proxy allowance still 0
6. polymarket clob balance shows proxy balance, but orders fail for allowance/balance

actual
approve set approves from eoa, not proxy, so contracts have no allowance on proxy funds.

code pointer
in src/main.rs, clob gets signature_type, approve does not:

Commands::Clob(args) => commands::clob::execute(..., cli.signature_type.as_deref())
Commands::Approve(args) => commands::approve::execute(...)

maybe also affected
approve check looks like eoa path too.
ctf subcommands seem same pattern as redeem issue.