tecnickcom / rpistat / 27878507910

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feat(metrics): collect system stats at scrape time, add robustness

Extract system-stats gathering into a new internal/sysstat package with
no metric or HTTP side effects, and rewrite the metrics package as a
Prometheus collector that reads a fresh snapshot on every scrape. This
makes /metrics correct independently of /stats traffic and drops series
for interfaces that are no longer present. The /stats JSON handler now
serializes the shared gatherer output, and the exported metric names and
labels are unchanged.

Add configurable network-interface exclusions (stats.excluded_nics, with
schema, default config, and CONFIG.md updates) and debug logging of
errors that were previously swallowed. Split the gatherer options into
options.go with dedicated option tests. Use an explicit, side-effect-free
Describe so collector registration does not run a system snapshot.

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