Returns document_associations rows for an asset in the authenticated tenant where entity_type is asset and entity_id is the path asset ID. The service joins documents to add original_filename, file_size, mime_type, and uploaded_at. It does not check whether the asset exists first, so nonexistent or cross-tenant asset IDs return 200 with an empty array. Response links currently point at /api/v2/assets paths. In the current route wiring, req.context may be absent because no route-level API-key auth wrapper sets it, causing a 500 before lookup.
Success response 200 · schema AssetDocumentListResponse
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