feat(license): Lizenz-System mit Ed25519-Verify gegen license.netcell-it.com
Portiert mail-gateway/internal/license (Verify, Cache, Trial, Signature) + DB-Mirror (internal/services/license) + REST-Handler (status/verify/key/clear) + UI-Page /license (Activate, Status, Limits, Features, Re-verify) + <LicenseBanner /> neben UpdateBanner (trial-expiring, expired, verify-failed) + Scheduler: täglich Re-verify (24h-Tick) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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