Get Douyin content creative duration

Returns Douyin video duration distribution for a category. Send tag_id (Category ID, required, does NOT support 0=all. Get fu..), end_date (End date YYYYMMDD); optional period. Returns video count and ratio per duration bucket (e.g. 0-15s, 15-60s, 60-180s, >180s). period: "week" (end_date must be a Sunday) or "month" (end_date must be month-end).