fix(frontend): instance infoページで不必要なapiリクエストが飛ぶのを抑止

[kakkokari-gtyih]

What

• モデレーションノート変更の検知をiAmModerator限定に変更
• 型定義まわりの修正

Why

Fix #13919

Additional info (optional)

Checklist

• [x] 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[bot]]

Codecov Report

Attention: Patch coverage is 0% with 43 lines in your changes missing coverage. Please review.

Project coverage is 19.97%. Comparing base (cdb0566) to head (8f4a58c). Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/components/MkChart.vue	0.00%	26 Missing :warning:
packages/frontend/src/pages/instance-info.vue	0.00%	17 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14515 +/- ## =========================================== - Coverage 19.97% 19.97% -0.01% =========================================== Files 725 725 Lines 100568 100579 +11 Branches 1047 1047 =========================================== Hits 20089 20089 - Misses 79935 79946 +11 Partials 544 544 ```

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[syuilo]

🙏🏿