fix(backend): 初期読込時に必要なフロントエンドのアセットがすべて読み込まれていない問題を修正

[kakkokari-gtyih]

What

#17238 から抜き出した修正

• https://ja.vite.dev/guide/backend-integration の定義に従って、必要なファイルへのリンクを全て読み込むように
• Viteのマニフェストファイルをconfigで保持するのをやめて、必要なデータを初回に一度計算した後はHtmlTemplateServiceに保持するように

Why

場合によっては一部のCSS等が読み込まれないことがある（今のところ問題なさそうだが、 #17238 ではこの問題が発生した）

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

❌ Patch coverage is 25.64103% with 87 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.52%. Comparing base (54e9426) to head (eb0beea).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ages/backend/src/server/web/HtmlTemplateService.ts	20.18%	87 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #17254      +/-   ##
===========================================
- Coverage    63.56%   63.52%   -0.04%     
===========================================
  Files         1161     1161              
  Lines       116210   116300      +90     
  Branches      8356     8353       -3     
===========================================
+ Hits         73866    73881      +15     
- Misses       40140    40215      +75     
  Partials      2204     2204              

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[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

[github-actions]

Backend memory usage comparison

Before GC

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	316.41 MB	309.95 MB	-6.46 MB	-2.04%
VmHWM	316.41 MB	312.21 MB	-4.20 MB	-1.32%
VmSize	23109.57 MB	23102.98 MB	-6.58 MB	-0.02%
VmData	1379.87 MB	1373.96 MB	-5.91 MB	-0.42%

After GC

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	316.42 MB	309.96 MB	-6.45 MB	-2.03%
VmHWM	316.42 MB	312.21 MB	-4.20 MB	-1.32%
VmSize	23109.57 MB	23103.23 MB	-6.33 MB	-0.02%
VmData	1379.87 MB	1374.21 MB	-5.66 MB	-0.41%

After Request

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	316.76 MB	310.30 MB	-6.45 MB	-2.03%
VmHWM	316.76 MB	312.43 MB	-4.32 MB	-1.36%
VmSize	23109.57 MB	23103.23 MB	-6.33 MB	-0.02%
VmData	1379.87 MB	1374.21 MB	-5.66 MB	-0.41%

See workflow logs for details

[syuilo]

🙏