refactor(runtime-host): specialize composition to interactive roots

[Sun-GLiang]

Summary

Specialize Runtime Host composition and kernel APIs to interactive storage roots.

This removes the unused StorageRootKind generic parameters and the eraseRootKind() adapter while preserving existing storage-root authentication, ownership, locking, lease, and lifecycle behavior.

Closes #3037

Verification

• npm run lint
• npm run format:check
• npm run build
• npm run typecheck
• node --test packages/runtime-host/dist/__tests__/host-kernel.test.js — 42 passed
• npm --workspace @maka/runtime-host run test:dist — 933 passed

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

[Sun-GLiang]

The failing Desktop E2E is a known baseline regression tracked in #3044. The focused test reproduces on main (5/5 failures) and on this branch with the same assertion; this PR only changes Runtime Host files and does not touch Desktop/UI or the failing test.

I’ll update the branch and rerun CI after the baseline fix lands.

[M4n5ter]

LGTM