fix(node): add constants metadata tail parity

[andrewtdiz]

Closes #3683.

Summary

• Add the deprecated flat node:constants metadata tail for libuv dirent/symlink/copyfile constants, POSIX file type/permission masks, selected POSIX open flags, and defaultCoreCipherList.
• Share the added values through the existing constants path so default import, namespace import, named imports, fs.constants, and crypto.constants.defaultCoreCipherList stay aligned.
• Update the API manifest and generated API docs for the newly covered flat constants.

Why batched

These entries are one constants metadata cluster: they use the same native module constant table, enumeration list, manifest exports, and import/parity surface. Keeping them together avoids repeated churn through the same generated docs and manifest paths.

Tests added

• test-parity/node-suite/constants/imports/metadata-tail.ts covers default/namespace/named import parity, enumerable keys, Linux open flag values, fs.constants alignment, Linux O_SYMLINK absence, and defaultCoreCipherList shape.

Verification

• TMPDIR="$PWD/target/tmp" PATH=/home/github-runner/actions-runner/externals/node24/bin:$PATH ./run_parity_tests.sh --suite node-suite --module constants - PASS 2/2, report test-parity/reports/parity_report_20260531_120700.json
• TMPDIR="$PWD/target/tmp" CARGO_BUILD_JOBS=1 RUSTC_WRAPPER= cargo check -p perry-runtime -p perry-codegen -p perry-api-manifest - PASS
• TMPDIR="$PWD/target/tmp" CARGO_BUILD_JOBS=1 RUSTC_WRAPPER= cargo test -p perry-codegen --test manifest_consistency - PASS 4/4
• cargo fmt --all -- --check - PASS
• git diff --check HEAD - PASS
• ./scripts/check_file_size.sh - PASS

Non-goals

• No broader zlib/http2 constants enumeration changes.
• No behavior changes outside the flat constants path, shared fs.constants values, and crypto.constants.defaultCoreCipherList.
• Platform-absent constants remain absent on unsupported targets.