Feat: タイムライン更新中に広告を挿入

[kakkokari-gtyih]

What

• タイムラインのリアルタイム更新中に広告を挿入できるようになりました
• 広告の配信頻度はコントロールパネルから設定可能
  • あまりにも短い間隔を指定したら警告が出ます
• デフォルトは無効（ 0 ）

Why

Fix #11808

Additional info (optional)

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (9240db3) 79.31% compared to head (4f15782) 79.28%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11989      +/-   ##
===========================================
- Coverage    79.31%   79.28%   -0.03%     
===========================================
  Files          930      929       -1     
  Lines        99381    99309      -72     
  Branches      8042     8042              
===========================================
- Hits         78820    78741      -79     
- Misses       20561    20568       +7     

Files	Coverage Δ
packages/backend/src/models/Meta.ts	100.00% <100.00%> (ø)
packages/frontend/src/components/MkInput.vue	100.00% <100.00%> (ø)
...ges/backend/src/server/api/endpoints/admin/meta.ts	77.56% <80.00%> (+0.02%)	⬆️
packages/backend/src/server/api/endpoints/meta.ts	74.40% <83.33%> (+0.14%)	⬆️
...kend/src/server/api/endpoints/admin/update-meta.ts	64.96% <60.00%> (-0.06%)	⬇️

... and 2 files with indirect coverage changes

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[kakkokari-gtyih]

API Extractorがミスってるのでちょっとお待ち下さいいけた

[kakkokari-gtyih]

[kakkokari-gtyih]

変な値が突っ込まれてもバグらないようになった

[syuilo]

👍🏻