Retrieves a paginated list of all folders, with optional filtering and sorting. Use this endpoint to browse the folder structure or to find a folderId before creating or moving an audience. Filter by createdById, updatedById, searchText (partial name match), or date ranges (createdAfter, createdBefore, updatedAfter, updatedBefore). Use sort to order results by name, createdAt, updatedAt, audienceCount, or recentlyViewed; prefix with - for descending order (default: -updatedAt). Use page[number] and page[size] (default 25, max 100) to paginate. Returns 200 with a paginated array of folder resources including audiences (list of audience IDs in each folder) and navigation links. Returns 400 if filter or sort parameters are invalid.