feat: add /bbox endpoint

[Kanahiro]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 27.63158% with 275 lines in your changes missing coverage. Please review.

Project coverage is 58.65%. Comparing base (c0e36c4) to head (8c98149).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/render/index.ts	16.27%	180 Missing ⚠️
src/server/index.ts	42.42%	95 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
- Coverage   63.39%   58.65%   -4.74%     
==========================================
  Files          19       18       -1     
  Lines        1262     1432     +170     
  Branches       87       93       +6     
==========================================
+ Hits          800      840      +40     
- Misses        460      590     +130     
  Partials        2        2              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.