List a document library's folders

Lists the folders of **one** of a project's two document libraries, A→Z. A folder belongs to a project *and* a library, so `kind` is required — there is no folder that spans both. `documentCount` reflects only the documents the caller may see: the Project-Information audience rule is applied, and folders that are empty *for the caller* are omitted for anyone who cannot manage the project, so a reader never opens a folder to find nothing. Folders are one level deep and **organisational only** — a folder never affects who can see a document. Use a returned `id` as `folderId` when listing documents or registering a new one.

curl -X GET "https://example.com/projects/497f6eca-6276-4993-bfeb-53cbbbba6f08/folders?kind=ohs"

{  "data": [    {      "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",      "projectId": "5a8591dd-4039-49df-9202-96385ba3eff8",      "kind": "ohs",      "name": "string",      "documentCount": 0    }  ]}

{  "error": {    "code": "unauthorized",    "message": "Missing or invalid API key."  }}

{  "error": {    "code": "read_only",    "message": "Your subscription is inactive. This action is read-only."  }}

{  "error": {    "code": "not_found",    "message": "Not found."  }}

{  "error": {    "code": "validation",    "message": "One or more inputs are invalid.",    "fields": {      "fieldName": "A message explaining what's wrong with this field."    }  }}