Setup OIDC for CodSpeed authentication

[Boshen]

Summary

• Add id-token: write permission at job level for OIDC authentication with CodSpeed
• Remove token parameter from CodSpeedHQ action (OIDC auth is now automatic)

This configures the workflow to use OpenID Connect (OIDC) for authentication with CodSpeed instead of using repository secrets.

🤖 Generated with Claude Code

[codspeed-hq]

CodSpeed Performance Report

Merging #426 will degrade performances by 1.77%

_{Comparing codspeed-oidc (51094e6) with main (3670c4f)}

Summary

❌ 1 regression
✅ 11 untouched

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	oxc[parallel]	50.6 ms	51.5 ms	-1.77%