Get Child Company Distribution

Returns child companies with their distribution status for a parent company event chain.
Only available for parent companies.
Supports two response formats:

• Tree format (default): Returns a recursive tree of companies with nested child_companies.
• Flat paginated format: When page parameter is provided, returns a flat paginated list
  with total_entries and _embedded.companies — each company includes parent_id,
  children_count, and enabled status. Supports text search via company[text].