[Bug] Crypto portfolio strategies can be backtested but cannot enable live automated trading

[chree188]

Problem or motivation

Description

Strategy API V2 Crypto portfolio strategies can be compiled and backtested successfully, but the “Live Automated Trading” execution mode is disabled when creating a deployment. Only “Signal Notifications” can be selected.

For Crypto perpetual strategies:

• A single-instrument CTA strategy can enable live automated trading.
• A multi-instrument portfolio strategy can only use signal notifications.

This appears to be caused by a frontend restriction that is inconsistent with the documented live-trading capabilities.

Steps to reproduce

1. Create a Strategy API V2 strategy with multiple Crypto instruments:

def initialize(context):
    context.set_universe([
        "Crypto:BTC/USDT@swap",
        "Crypto:ETH/USDT@swap",
    ])
    context.subscribe(frequency="4h")

### Proposed solution

_No response_

### Alternatives considered

_No response_