fix(backend): FreeBSDで起動できない問題を修正

[kakkokari-gtyih]

What

• @napi-rs/canvasがFreeBSDに対応していないためcanvasに変更
• FreeBSDでの起動の障害となっていたクラスの参照を変更

Why

Fix #12764

Additional info (optional)

FreeBSDの環境がないので検証してない
（ https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/887 では起動できることが確認されている）

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

[github-actions]

このPRによるapi.jsonの差分
差分はありません。
Get diff files from Workflow Page

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 40.90%. Comparing base (20cc6d3) to head (ab74696).

Files with missing lines	Patch %	Lines
packages/backend/src/misc/gen-identicon.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #15418      +/-   ##
===========================================
+ Coverage    38.93%   40.90%   +1.97%     
===========================================
  Files         1609     1609              
  Lines       161929   161929              
  Branches      2808     3738     +930     
===========================================
+ Hits         63052    66242    +3190     
+ Misses       98403    95210    -3193     
- Partials       474      477       +3     

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[Mar0xy]

For information about @napi-rs/canvas:

@napi-rs/canvas uses Skia which does not at all support FreeBSD OOTB without modifications/patching. See attached image from a Google dev saying that supporting FreeBSD is not planned.

[kakkokari-gtyih]

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[kakkokari-gtyih]

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