fix(sv): pnpm 11 install no longer fails for cloudflare adapter

[jycouet]

Closes discord exchange 😅

Description

• cli/create.ts: resolve package manager before runAddonsApply so pnpm-only logic in add-ons (drizzle, tailwindcss, sveltekit-adapter) actually runs. Previously workspace.packageManager was still 'npm' (default) when add-ons ran, silently skipping if (packageManager === 'pnpm') branches.
• addons/sveltekit-adapter.ts: register workerd and sharp as pnpm allow-builds when the cloudflare adapter is selected.
• core/package-manager.ts: on pnpm ERR_PNPM_IGNORED_BUILDS, don't crash. Surface a short warning pointing at pnpm approve-builds and continue.

Checklist

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[changeset-bot]

🦋 Changeset detected

Latest commit: de50934

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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commit: de50934