fix(runner): accept raw IPv6 inputs without treating as host:port

[Rhan2020]

Fixes #859.

When passing an IPv6 literal like 2a03:2880:11ff:17::face:b00c (no brackets) as input, the runner treated it as host:port and failed parsing.

This change:

• Parses the input URL (if any) and then uses a loose host/port split.
• Accepts bracketed IPv6 with port ([...]:443) and classic host:port.
• Treats multi-colon unbracketed values as IPv6 literals with no explicit port.

Added a small unit test covering domain, IPv4, IPv6, and bracketed IPv6+port.

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[neo-by-projectdiscovery-dev]

Neo - PR Security Review

No security issues found

Highlights

• Adds splitHostPortLoose helper function to parse IPv6 addresses with or without port specifications
• Fixes -l -list option does not understand multiple prefixes, comma-separated in a single line #859 by properly handling bare IPv6 literals like 2a03:2880:11ff:17::face:b00c
• Supports bracketed IPv6 with port [2a03:...:1]:443 and classic domain:port formats
• Includes unit tests covering domain, IPv4, IPv6, and bracketed IPv6+port edge cases

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