List Keys for Marketplace

[hayesZach]

Closes CSF-883
Refs CSF-876
Refs CSF-697

Note

Medium Risk
Introduces a new authenticated GET /keys endpoint that returns all keys for a marketplace; while permission-gated, it exposes key metadata and relies on correct scoping to the caller’s marketplace.

Overview
Adds a new marketplace API endpoint GET /keys that lists all API keys for the authenticated key’s MarketplaceSlug, returning them as { "data": [...] }.

Updates the marketplace router to register the new route alongside key creation, and adds comprehensive handler tests covering successful listing, ordering/filtering by marketplace, and context/database error paths.

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[linear]

CSF-883 List Keys For Marketplace

CSF-876 Marketplace Endpoints

CSF-697 Implement Skeleton For API Handler