PoC: types: reject double wildcard route paths

[usualoma]

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[github-actions]

HTTP Performance Benchmark

Framework	Runtime	Average	Ping	Query	Body
hono (origin/main)	bun	46,920.35	57,979.54	45,031.79	37,749.73
hono (current)	bun	45,273.13	56,584.91	42,800.48	36,434.01
Change		-3.51%	-2.41%	-4.95%	-3.49%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.00%. Comparing base (f10dee8) to head (21260e9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4923   +/-   ##
=======================================
  Coverage   93.00%   93.00%           
=======================================
  Files         177      177           
  Lines       11999    11999           
  Branches     3616     3616           
=======================================
  Hits        11160    11160           
  Misses        839      839           

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