[RaphaelFakhri]

Change summary

Node.url() builds the node URL as {protocol}://{host}:{port}{path}. When the host is an IPv6 literal, the result (for example, http://::1:8108) is not a valid URL, and every request fails with httpx.InvalidURL: Invalid port.

This affects both node formats:

• URL strings such as "http://[::1]:8108", because Node.from_url stores urlparse(url).hostname, which drops the brackets.
• Node dicts such as {"host": "::1", "port": 8108, "protocol": "http"}.

Node.url() now encloses a host that contains : in brackets, unless the host is already bracketed. IPv4 and hostname nodes produce the same URL as before.

Tests added in tests/node_test.py:

• test_node_url_ipv6_host
• test_node_url_bracketed_ipv6_host
• test_node_from_url_ipv6

The first and third fail on master and pass with this change.

PR checklist

• Tests added for the change.
• ruff check and mypy src/typesense pass.

Fixes #154