Add Renovate support for uv dependency management in InferenceSystem

[Copilot]

dependabot does not support uv, so InferenceSystem's Python dependencies (pyproject.toml + uv.lock) were not receiving automated update PRs. Renovate supports uv natively and fills this gap.

Changes

• .github/renovate.json (new): Configures Renovate with enabledManagers: ["uv"] so it handles only what dependabot cannot — uv-managed packages. Mirrors the previous dependabot InferenceSystem settings: Saturday schedule, grouped PRs, inference system/dependencies labels, minor+patch only (no major bumps).

• .github/dependabot.yml: Removes the now-inapplicable pip/InferenceSystem entry (InferenceSystem has no requirements.txt; it uses pyproject.toml+uv.lock). Adds a comment pointing to Renovate.

Note: The Renovate GitHub App must be installed on the orcasound org or orcahello repo for this config to take effect.

Original prompt

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This section details on the original issue you should resolve

<issue_title>dependabot doesn't currently support uv but renovate does</issue_title>
<issue_description>dependabot doesn't currently support uv, but renovate does. We should file an issue to add renovate support to keep dependencies up to date.

Originally posted by @dthaler in #447 (comment)
</issue_description>

Comments on the Issue (you are @copilot in this section)

@dthaler This should be addressed after PR #448 is merged.

• Fixes dependabot doesn't currently support uv but renovate does #450

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[dthaler]

This PR configures renovate but it won't run until it's installed for the orcasound org to use.

[dthaler]

Renovate is now installed for orcasound to use so this PR is ready to go.