Get Douyin content consumer portrait

Returns Douyin consumer (viewer) portrait for a category (i.e. profile of users who watch videos in this category). Send tag_id (Category ID, required, does NOT support 0=all. Get fu..), end_date (End date YYYYMMDD); optional period. Returns consumer portrait: gender, age group, region, interest, device distributions. period: "week" (end_date must be a Sunday) or "month" (end_date must be month-end, e.g. 20260331).