enhance(backend): summalyの結果をキャッシュするように

[kakkokari-gtyih]

What

Why

#13187

Close #15175

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 5.00000% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 24.81%. Comparing base (408d056) to head (e3e001a).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ckages/backend/src/server/web/UrlPreviewService.ts	0.00%	21 Missing and 4 partials ⚠️
packages/backend/src/misc/cache.ts	13.33%	11 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #17367      +/-   ##
===========================================
+ Coverage    15.22%   24.81%   +9.59%     
===========================================
  Files          247     1155     +908     
  Lines        12322    39327   +27005     
  Branches      4170    10946    +6776     
===========================================
+ Hits          1876     9759    +7883     
- Misses        8183    23697   +15514     
- Partials      2263     5871    +3608     

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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	307.78 MB	301.24 MB	-6.53 MB	-2.12%
VmHWM	309.17 MB	301.24 MB	-7.93 MB	-2.56%
VmSize	23085.67 MB	23078.03 MB	-7.63 MB	-0.03%
VmData	1351.95 MB	1344.47 MB	-7.48 MB	-0.55%

After GC

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	307.92 MB	301.26 MB	-6.66 MB	-2.16%
VmHWM	309.17 MB	301.26 MB	-7.91 MB	-2.56%
VmSize	23085.75 MB	23078.53 MB	-7.21 MB	-0.03%
VmData	1352.04 MB	1344.97 MB	-7.06 MB	-0.52%

After Request

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	308.24 MB	302.21 MB	-6.02 MB	-1.95%
VmHWM	309.38 MB	302.21 MB	-7.16 MB	-2.31%
VmSize	23085.75 MB	23079.37 MB	-6.38 MB	-0.02%
VmData	1352.04 MB	1345.80 MB	-6.23 MB	-0.46%

See workflow logs for details