fix: stop to use /bbox/minx,miny,maxx,maxy.png -> /clip.png

[Kanahiro]

close #92

[codecov]

Codecov Report

Attention: Patch coverage is 61.11111% with 7 lines in your changes missing coverage. Please review.

Project coverage is 59.18%. Comparing base (c5771ee) to head (bcee5ba).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/server/index.ts	61.11%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
- Coverage   59.22%   59.18%   -0.04%     
==========================================
  Files          19       19              
  Lines        1420     1426       +6     
  Branches       94       95       +1     
==========================================
+ Hits          841      844       +3     
- Misses        576      579       +3     
  Partials        3        3              

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