refactor(hono-base): add type annotations

[yusukebe]

Added the missing type annotations. This change improves the type performance slightly.

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]

Bundle size check

	main (d454b31)	#4591 (6b77f59)	+/-
Bundle Size (B)	18,377B	18,377B	0B
Bundle Size (KB)	17.95K	17.95K	0K

Compiler Diagnostics (tsc)

	main (d454b31)	#4591 (6b77f59)	+/-
Files	303	303	0
Lines	141,168	141,168	0
Identifiers	128,951	128,955	4
Symbols	269,872	269,855	-17
Types	206,566	206,545	-21
Instantiations	666,443	666,425	-18
Memory used	345,467K	358,440K	12,973K
I/O read	0.02s	0.03s	0.01s
I/O write	0s	0s	0s
Parse time	0.73s	0.84s	0.11s
Bind time	0.29s	0.32s	0.03s
Check time	2.55s	2.6s	0.05s
Emit time	0s	0s	0s
Total time	3.57s	3.77s	0.2s

Compiler Diagnostics (typescript-go)

	main (d454b31)	#4591 (6b77f59)	+/-
Files	303	303	0
Lines	141,170	141,170	0
Identifiers	128,914	128,918	4
Symbols	391,095	388,312	-2,783
Types	378,717	378,675	-42
Instantiations	1,078,045	1,078,004	-41
Memory used	257,782K	257,360K	-422K
Memory allocs	2,721,128	2,720,895	-233
Config time	0.001s	0.001s	0s
Parse time	0.092s	0.099s	0.007s
Bind time	0.019s	0.022s	0.003s
Check time	0.638s	0.65s	0.012s
Emit time	0s	0s	0s
Total time	0.821s	0.832s	0.011s

---

Reported by octocov

[github-actions]

HTTP Performance Benchmark

Framework	Runtime	Average	Ping	Query	Body
hono (origin/main)	bun	36,860.18	49,723.52	32,800.40	28,056.63
hono (current)	bun	36,791.71	49,674.06	32,624.20	28,076.87
Change		-0.19%	-0.10%	-0.54%	+0.07%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.56%. Comparing base (d454b31) to head (ca536b8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4591   +/-   ##
=======================================
  Coverage   91.56%   91.56%           
=======================================
  Files         173      173           
  Lines       11256    11256           
  Branches     3266     3266           
=======================================
  Hits        10307    10307           
  Misses        948      948           
  Partials        1        1           

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