chore: set up renovate

[longlho]

Summary

• Add Renovate using the recommended preset.
• Hold dependency updates until the released version is at least 7 days old.
• Enable the dependency dashboard and semantic Renovate PR titles.

Test

• node -e "JSON.parse(require('fs').readFileSync('renovate.json','utf8'))"
• git diff --check
• pnpm format
• PR_TITLE='chore: set up renovate' pnpm lefthook run pre-commit --force