umputun / remark42 / 29047031030

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fix(trusted-proxy): warn on catch-all, cover more cases, trim wording

Follow-up to the review notes on #2116:
- warn at startup when --trusted-proxy contains a catch-all (0.0.0.0/0 or ::/0),
  which trusts every peer and re-opens the bypass - mirrors the unset-case warning
- realIPMiddleware tests: cover the unparseable-peer and trusted-peer-without-header
  branches, and make the observed values per-call so subtests don't share closure locals
- trim the flag description and shorten the startup warning to the terse [WARN] style

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