IPv6 node addresses produce an invalid request URL #154

A node with an IPv6 address can't be reached. Node.url() joins the host and port as {host}:{port} without enclosing an IPv6 literal in brackets, so every request fails with httpx.InvalidURL before it is sent.

Both ways of configuring a node are affected:

• A URL string such as "http://[::1]:8108". Node.from_url takes the host from urlparse(url).hostname, which strips the brackets, so the host is stored as ::1.
• A node dict such as {"host": "::1", "port": 8108, "protocol": "http"}.

Steps to reproduce

import typesense

client = typesense.Client({
    "api_key": "xyz",
    "nodes": ["http://[::1]:8108"],
    "num_retries": 0,
})
print(client.api_call.node_manager.nodes[0].url())
client.operations.is_healthy()

Actual behavior

http://::1:8108
httpx.InvalidURL: Invalid port: ':1:8108'

Expected behavior

The client sends requests to http://[::1]:8108.

Environment

• typesense-python: master (8727d2b)
• httpx 0.28.1