- DeviceCache.pattern_matches?: replace a 3-branch `cond` with a
two-clause `case` on `String.contains?(pattern, "?")`. The old `*`
branch was dead code (it did the same exact-match compare as the
fallback), so it's removed.
- Telemetry.DatabaseMetrics.collect_postgres_metrics: dispatch on
environment atom via multi-clause private functions instead of
`if Application.get_env(...) == :test`.
New tests:
- DeviceCache wildcard/exact lookup paths exercised via a seeded cache.
- MobileUserSocket connect/3 for x_headers/peer_data/empty info and
rate-limit deny.
- DatabaseMetrics pool-metrics emission captured via :telemetry handler
and the :test-env short-circuit.
