fix: Normalize schemeless Nova hosts

[functionistic]

Summary

• normalize any schemeless Nova host with a parser-based stdlib check
• keep fully-qualified URLs unchanged
• extend config tests for generic schemeless hosts and isolate NATS_BROKER in tests

Testing

• uv run pytest tests/test_config.py

[Copilot]

Pull request overview

This PR updates Nova’s configuration normalization so schemeless host values are automatically treated as valid HTTP origins, enabling consistent downstream NATS URL derivation while leaving already-fully-qualified URLs unchanged.

Changes:

• Normalize schemeless NovaConfig.host values using urllib.parse.urlparse and prefix http:// when appropriate.
• Extend config tests to cover generic schemeless hosts and localhost-with-port inputs.
• Add an autouse pytest fixture to isolate NATS_BROKER across tests.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
nova/config.py	Adds parser-based detection of schemeless hosts and normalizes them to http://….
tests/test_config.py	Adds host normalization test cases and isolates NATS_BROKER via an autouse fixture.

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[Copilot]

Pull request overview

Normalizes schemeless NovaConfig.host values using stdlib URL parsing so that derived NATS websocket URLs behave consistently across different host formats.

Changes:

• Update NovaConfig._normalize_host_prefix to keep fully-qualified URLs unchanged and prefix http:// for schemeless hosts that parse as a netloc.
• Extend config tests to cover generic schemeless hosts and localhost, and make NATS_BROKER isolation automatic via an autouse fixture.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
nova/config.py	Implements parser-based normalization for schemeless hosts while leaving fully-qualified URLs untouched.
tests/test_config.py	Adds/adjusts tests for schemeless host normalization and isolates NATS_BROKER across tests.

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