FDN-03: objekt-storage-abstraktion

Ein Driver-Interface, zwei austauschbare Treiber: LocalDriver (Entwicklung,
Dateisystem, HMAC-signierte URLs) und S3Driver (Produktion, S3-kompatibel
via aws-sdk-go-v2, echte presigned URLs). Pfadschema documents/<id>/
revisions/<id> innerhalb des mandantenspezifischen Buckets. Service
verbindet Driver mit Nutzungsmeldung an Core LIC-05 (HTTPUsageReporter,
Vertrag von internal/resync.Handler nachgebildet, DMS kann Cores internal/-
Pakete als eigenes Modul nicht importieren).

Auf 192.168.1.131 verifiziert, S3-Treiber gegen echtes lokal installiertes
MinIO (kein Mock): Round-Trip beide Treiber, abgelaufene presigned URL real
mit 403 abgewiesen (manuell zusaetzlich zum Unit-Test verifiziert), klare
ErrNotFound bei fehlendem Objekt beide Treiber, Nutzungsmeldung mit
korrektem Tenant/Metrik/Delta bei Put/Delete.

Befund dokumentiert: Cores internal/resync.Handler (Gegenstelle fuer die
Nutzungsmeldung) ist noch in keinem cmd/*/main.go verdrahtet (dieselbe
Fehlerklasse wie QA-05/AUD-06) - HTTPUsageReporter daher gegen den
dokumentierten Vertrag getestet, nicht gegen eine laufende Core-Instanz.
Siehe dms/docs/FDN-03-PRUEFPROTOKOLL.md.

golangci-lint auf v2.1.6 aktualisiert (v1.63.4 konnte go1.24-Zielstand
nicht linten), .golangci.yml auf v2-Konfigurationsformat migriert.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HhgFcLS8tYMhDJpP74C6AQ

dms/go.sum

@@ -1,3 +1,39 @@
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