Add sys alias to API manifest

[andrewtdiz]

Closes #2730.

Summary:

• register sys as a manifest-known Node submodule
• mirror the current public util module manifest rows under sys for the deprecated alias surface
• add a manifest unit test that keeps sys aligned with the public util rows
• regenerate API reference and TypeScript declarations with declare module "sys"

Validation:

• PATH="/root/.npm/_npx/8758e404b5eed2f3/node_modules/.bin:$PATH" node test-parity/node-suite/sys/imports/util-alias.ts
• env RUSTC_WRAPPER= PATH="/root/.npm/_npx/8758e404b5eed2f3/node_modules/.bin:$PATH" ./run_parity_tests.sh --suite node-suite --module sys (report: test-parity/reports/parity_report_20260529_222237.json)
• env RUSTC_WRAPPER= cargo test -p perry-api-manifest
• env RUSTC_WRAPPER= cargo test -p perry-codegen --test manifest_consistency
• env RUSTC_WRAPPER= cargo check -p perry-api-manifest -p perry-hir -p perry-codegen -p perry-runtime
• env RUSTC_WRAPPER= ./scripts/regen_api_docs.sh
• cargo fmt --all -- --check
• git diff --check
• jq empty test-parity/known_failures.json test-parity/threshold.json
• ./scripts/check_file_size.sh