docs(tiktok): mark each setting's posting-method and media-type axes

[giladresisi]

Stacked on #11 (docs/tiktok-posting-method). Review/merge that first; GitHub will auto-retarget this PR to main once it merges. The diff below shows only the media-type change.

Why

A production user ticked "Video made with AI" on a TikTok post that used the UPLOAD posting method, and the label was silently dropped. Even within DIRECT_POST, several TikTok settings only apply to one media type — a setting sent on the wrong axis is discarded while the API still reports success.

The app side was fixed in gitroomhq/postiz-app#1728 (hides settings TikTok silently ignores, adds @JSONSchema descriptions and provider @Rules). An agent following this skill reads the static docs in this repo, not the postiz-app source, so those docs need to match.

Two independent axes (verified against TikTok's API reference and postiz-app's buildTikokPostInfoBody)

1. Posting method — every TikTok setting except title requires DIRECT_POST (established in docs(tiktok): warn that content_posting_method UPLOAD never publishes #11).
2. Media type (within DIRECT_POST):
   • Video-only: duet, stitch, video_made_with_ai
   • Photo-only: autoAddMusic
   • Both: privacy_level, comment, brand_content_toggle, brand_organic_toggle

Changes (docs/markdown only)

• PROVIDER_SETTINGS.md — spell out both axes; tag every TikTok setting (DIRECT_POST-only; video-only / photo-only / both). autoAddMusic is no longer presented as generally required and is dropped from the video example (it's photo-only).
• SKILL.md — add generic Rule 4: fetch integrations:settings before scheduling and honor the returned rules + per-field descriptions (inapplicable settings are silently discarded, not rejected). Fix the example's wrong "privacy" key → privacy_level.
• README.md — same "privacy" → privacy_level fix; complete the settings-table row.
• PROVIDER_SETTINGS_SUMMARY.md — complete the TikTok row (was missing content_posting_method, video_made_with_ai, brand toggles); drop autoAddMusic from the video example.
• INTEGRATION_SETTINGS_DISCOVERY.md — one behavioral line per axis; autoAddMusic no longer listed as required.
• examples/tiktok-video.json — drop photo-only autoAddMusic from the video post.

Related

• Mirrors app fix fix(tiktok): stop offering settings TikTok silently ignores postiz-app#1728
• Companion docs docs(tiktok): document which settings apply per posting method and media type postiz-docs#231
• Stacked on docs(tiktok): warn that content_posting_method UPLOAD never publishes #11

🤖 Generated with Claude Code

[postiz-contribution]

Contribution-checker quality warning
Heuristic score: 3/100 (low). This is a non-blocking warning surfaced by the project's quality settings.

Heuristics that flagged:

• Excessive inline code references: 30 inline refs (>3)
• AI watermark phrase: Matched: "Generated with Claude Code"
• Commit message too long: Longest: 1350 chars
• Cross-module sprawl: 6 top-level dirs

If this is a genuine contribution, please add detail to your PR description and tighten the diff scope before reviewers look at it.

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