Fix release publish package metadata

[petyosi]

Summary

• Add the missing vitest catalog entry used by packages/logfire-api.
• Move package LICENSE cleanup from postpack to postpublish for all publishable packages.

Root Cause

After #142 fixed the frozen-lockfile failure, the main release job reached changesets/action publish mode and failed inside pnpm run release.

The first publish blocker was:

[ERR_PNPM_CATALOG_ENTRY_NOT_FOUND_FOR_SPEC] No catalog entry 'vitest' was found for catalog 'default'.

packages/logfire-api/package.json uses "vitest": "catalog:", but pnpm-workspace.yaml only had a vitest override, not a catalog entry.

While verifying the fix with pnpm publish --dry-run, pnpm 11 exposed a second publish lifecycle issue: postpack removed the copied LICENSE before pnpm finished publishing, causing an ENOENT on LICENSE. Moving cleanup to postpublish keeps LICENSE present through packing/publish and still cleans it afterward.

Verification

• pnpm publish -r --access public --dry-run --no-git-checks
• vp install --frozen-lockfile
• vp check
• vp run --filter "./packages/*" build