chore: migrate to pnpm v11

[antfu]

Description

Migrates the monorepo from pnpm v10 to pnpm v11.4.0. The repo's packageManager field is bumped, onlyBuiltDependencies is folded into allowBuilds (v11 removed the former), pnpm/action-setup is bumped to @v6 in the CI source template, and CONTRIBUTING.md / AGENTS.md now state pnpm@11.x.

Linked Issues

Additional context

minimumReleaseAge: 0 is set in pnpm-workspace.yaml to bypass v11's new 24h freshness check, which blocked install against the freshly-published @devframes/hub@0.5.2 and devframe@0.5.2; can be removed once those age past 24h if you want the default supply-chain guard back. The generated pnpm/action-setup SHA in ci.yml is still the v4-era SHA because actionspack deduplicates with sxzz/workflows' own pin, but that action reads packageManager so CI installs pnpm 11 correctly. Verified locally: pnpm install, pnpm build, pnpm typecheck, pnpm test (150 passed), pnpm lint, and pnpm i --frozen-lockfile --ignore-scripts --offline all pass.

This PR was created with the help of an agent.

[pkg-pr-new]

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commit: ba6a06e