feat: add configurable port and switch to IPv4 by default

[mr-wuliu]

• Add PTY_WEB_PORT env var for fixed port (0 = random)
• Change default hostname from ::1 (IPv6) to 127.0.0.1 (IPv4)
• Update README with new environment variable

[shekohex]

CI is failing after your new changes.

[shekohex]

Looks good, but can you rebase your PR?

[mr-wuliu]

Looks good, but can you rebase your PR?

Thanks! I've rebased the PR.

By the way, I noticed the project prefers using [::1] instead of 127.0.0.1. Is there a specific reason for favoring IPv6 loopback here?

[shekohex]

Looks good, but can you rebase your PR?

Thanks! I've rebased the PR.

By the way, I noticed the project prefers using [::1] instead of 127.0.0.1. Is there a specific reason for favoring IPv6 loopback here?

The original author of the Frontend app mentioned this

I'm not sure why we should be changing this again now, but lets ping @MBanucu just in case.

[mr-wuliu]

Looks good, but can you rebase your PR?

Thanks! I've rebased the PR.
By the way, I noticed the project prefers using [::1] instead of 127.0.0.1. Is there a specific reason for favoring IPv6 loopback here?

The original author of the Frontend app mentioned this

I'm not sure why we should be changing this again now, but lets ping @MBanucu just in case.

Respecting the original author's preference, I changed the default host back to [::1]. This is still configurable via
PTY_WEB_HOSTNAME for environments that need a different host.