node info uses --ip instead of --rpc-url, inconsistent with other commands

[devrel-ditto]

Problem

Every command uses --rpc-url for specifying a custom endpoint, but node info uses --ip:

platform node info --ip 127.0.0.1          # works
platform node info --rpc-url http://127.0.0.1:9650  # ignored, still requires --ip

This is confusing because --rpc-url is a global flag that works everywhere else (wallet, transfer, subnet, etc).

Suggested Fix

• Accept --rpc-url as the primary way to specify the node (extract host from URL)
• Keep --ip as an alias for backward compatibility
• Default port to 9650 when only an IP is provided

Environment

• platform-cli v1.0.1