chore: add packageManager field to package.json

[yusukebe]

No description provided.

[github-actions]

Bundle size check

	main (3e5a6e8)	#4363 (eaa5eef)	+/-
Bundle Size (B)	18,320B	18,320B	0B
Bundle Size (KB)	17.89K	17.89K	0K

Compiler Diagnostics (tsc)

	main (3e5a6e8)	#4363 (eaa5eef)	+/-
Files	300	300	0
Lines	140,197	140,197	0
Identifiers	127,052	127,052	0
Symbols	264,416	264,416	0
Types	156,297	156,297	0
Instantiations	541,298	541,298	0
Memory used	312,735K	317,001K	4,266K
I/O read	0.02s	0.03s	0.01s
I/O write	0s	0s	0s
Parse time	0.69s	0.72s	0.03s
Bind time	0.3s	0.32s	0.02s
Check time	2.62s	2.76s	0.14s
Emit time	0s	0s	0s
Total time	3.61s	3.8s	0.19s

Compiler Diagnostics (typescript-go)

	main (3e5a6e8)	#4363 (eaa5eef)	+/-
Files	269	269	0
Lines	118,086	118,086	0
Identifiers	116,485	116,485	0
Symbols	354,396	354,396	0
Types	278,693	278,693	0
Instantiations	3,533,810	3,533,810	0
Memory used	223,762K	223,738K	-24K
Memory allocs	9,938,742	9,938,743	1
Parse time	0.085s	0.08s	-0.005s
Bind time	0.019s	0.017s	-0.002s
Check time	1.438s	1.489s	0.051s
Emit time	0s	0s	0s
Total time	1.546s	1.588s	0.042s

---

Reported by octocov

[github-actions]

HTTP Performance Benchmark

Framework	Runtime	Average	Ping	Query	Body
hono (origin/main)	bun	36,861.35	48,883.69	32,638.56	29,061.80
hono (current)	bun	37,106.18	51,791.23	31,331.00	28,196.32
Change		+0.66%	+5.95%	-4.01%	-2.98%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.32%. Comparing base (3e5a6e8) to head (02bb9da).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4363   +/-   ##
=======================================
  Coverage   91.32%   91.32%           
=======================================
  Files         171      171           
  Lines       10899    10899           
  Branches     3140     3139    -1     
=======================================
  Hits         9953     9953           
  Misses        945      945           
  Partials        1        1           

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