Marcel 67368b4413 docs(ocr): annotate metrics binding + /metrics exposure + pin client ...

Three small drops that pay back later:
- Note that main.metrics is import-time bound and tests must
  monkeypatch `main.metrics`, not the registry.
- Flag the /metrics endpoint as unauthenticated and cross-link the
  Caddy-block snippet in docs/OBSERVABILITY.md.
- Pin prometheus-client to the exact 0.25.0 patch version already
  resolved by prometheus-fastapi-instrumentator 7.0.0, so an upstream
  bump cannot silently slip in.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-21 17:04:28 +02:00

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