Read one TikTok campaign in full

Reads one campaign together with every ad group under it: objective, budget and mode, and per ad group the optimisation goal, billing event, bid, schedule, placements and targeting (locations, ages, gender, languages, interests). Use when: the user asks why a campaign behaves the way it does, or before changing anything on it — the ad group settings are where nearly every TikTok delivery problem lives. Do not use it to list many campaigns; that is tiktok_list_campaigns. Do not use it for results; that is tiktok_get_campaign_performance. Returns the optimisation goal and billing event per ad group, which together decide what TikTok is actually buying. An ad group optimising for CLICK and billed CPC buys clicks regardless of what happens next; one optimising for CONVERT against a pixel event buys that event. Mismatched expectations here are the usual reason a campaign "works" and still produces nothing the user wanted. Also returns the raw location ids rather than place names; call tiktok_search_targeting to turn an id back into a name before quoting it to the user.