[ENHANCEMENT] Add commit-message API profile settings UI #291

Problem (one or two sentences)

Users need a visible way to configure the dedicated API profile used for commit-message generation.

Part of #145.

Context (who is affected and when)

Prompt-related quick actions are configured from Settings > Prompts.

Desired behavior (conceptual, not technical)

Settings lets users choose either the current API config or a saved API config for commit-message generation.

Constraints / preferences (optional)

The control must save through the normal Settings save flow and must not reuse enhancementApiConfigId.

Request checklist

• I've searched existing Issues and Discussions for duplicates
• This describes a specific problem with clear context and impact

Zoo Code Task Links (optional)

No response

Optional (for contributors): You can stop here if you're just proposing the improvement.

Acceptance criteria (optional)

• The selector lists existing API profiles.
• A Use current config option is available.
• Selection persists as commitMessageApiConfigId.
• The control binds through SettingsView cached state.
• Tests cover rendering and state update where practical.

Proposed approach (optional)

Mirror the enhancement API profile selector behavior, but store the value in commitMessageApiConfigId.

Trade-offs / risks (optional)

Using the wrong setting key would couple commit generation to prompt enhancement unexpectedly.