fix(ruff): resolve ruff errors blocking CI in app/routes/vms.py and tests

[t0kubetsu]

Context

Commit extracted from feat/ci-hardening that does not touch CI configuration files (.github/).

This commit fixes Python linting errors surfaced by the new CI workflow — it belongs in a dedicated fix branch rather than mixed into CI infrastructure work.

Changes

• bdc95f9 — fix(ci): resolve ruff errors blocking CI
  • Add missing from typing import Any import (F821)
  • Rename ambiguous loop variable l → line (E741)
  • Remove unused pytest and Path imports from tests/test_ws_helpers.py (F401)

Files

• app/routes/vms.py
• tests/test_ws_helpers.py