Add POLY_1271 deposit wallet support

[sharananurag998]

What changed

• add poly-1271 as a supported CLI signature type
• add --funder, POLYMARKET_FUNDER, and optional config-file funder support
• pass the explicit deposit wallet to the official CLOB V2 SDK for authentication, balances, orders, and trades
• show the configured funder in wallet output and use it for read-only approval checks
• reject direct on-chain approval and CTF mutations for deposit wallets instead of sending them from the signer EOA
• validate signature-type values and document the deposit-wallet setup

Why

The V2 Rust SDK already supports SignatureType::Poly1271, but the CLI only mapped EOA, proxy, and Gnosis Safe modes and had no way to supply the required deposit-wallet funder. Email and social-login accounts backed by Polymarket deposit wallets therefore authenticated against the wrong wallet or could not see their collateral.

Impact

Users with a Polymarket deposit wallet can authenticate to CLOB V2 and use trading and account commands with the correct funding address. Existing EOA, proxy, and Gnosis Safe configurations remain backward compatible.

Validation

• cargo check --all-targets
• cargo test --all-targets (138 tests passed)
• cargo clippy --all-targets -- -D warnings
• live read-only CLOB authentication and collateral lookup against a real POLY_1271 deposit wallet; no order was created or posted

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Note

Medium Risk
Changes CLOB authentication and order signing for a new wallet mode; validation reduces wrong-wallet auth, but trading behavior depends on the upgraded SDK.

Overview
Adds poly-1271 so email/social Polymarket accounts can use the CLI against their deposit wallet, not just EOA/proxy/Gnosis Safe modes. Users must supply the funding address via --funder, POLYMARKET_FUNDER, or config funder; supplying a funder with any other signature type is rejected so CLOB auth cannot target the wrong wallet.

CLOB authentication and trading paths pass the funder into polymarket_client_sdk_v2 0.7.0 (bumped from 0.5.1 for deposit-wallet maker/signer and ERC-7739 signatures). Wallet create/import/show persist and display the funder; approve check resolves the owner from the funder in poly-1271 mode.

On-chain mutations (approve set, CTF split/merge/redeem) are blocked for poly-1271 with a clear error; signature type parsing is stricter (unknown types error instead of defaulting to EOA). README and integration tests cover setup and pre-network validation.

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