Explain TikTok objectives and what each one needs

Explains what each TikTok campaign objective buys, which optimisation goals and billing events it allows, what it requires before it can be created, and what Adako can build end to end. Use when: the user describes a goal in their own words ("I want sales", "I want followers") and a campaign has to be chosen, or before any create so the objective, goal and billing event are a valid combination rather than a guess. Do not skip it before tiktok_create_video_campaign. An invalid combination is rejected by TikTok with a numeric code and no explanation; this tool is what prevents that round trip. Do not promise conversion optimisation without a pixel. WEB_CONVERSIONS requires a pixel id and a specific event, and a pixel with too few recent events will not leave the learning phase however high the budget goes — check tiktok_list_pixels first. Returns, per objective: what it is for, its valid goal/billing pairs, what it requires, and the minimum daily budget in the account's currency. Retired goal names (VIDEO_VIEW, PROFILE_VISIT) are not listed; a create that still sends one is moved to its replacement and the preview says so. Costs nothing.