Add media verification addon with C2PA/ProofMode support

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Introduces a new zammad-addon-media-verify package that uses the proofmode
Ruby gem (built from proofmode-rust) to verify media attachments on tickets
for C2PA content credentials and ProofMode cryptographic proofs.

The addon runs as a Zammad scheduled job that:
- Scans incoming ticket articles for media attachments (images, video, audio, PDFs, ZIPs)
- Calls proofmode check_files() to verify C2PA manifests, PGP signatures,
  OpenTimestamps, and EXIF metadata
- Posts a human-readable verification report as an internal note on the ticket
- Tracks checked articles via preferences to avoid duplicate processing

Also restores the zammad-addon-common package (previously removed in repo cleanup)
to share build tooling (ZPM builder and migration generator) between addon packages,
keeping things DRY. The link addon now imports from common instead of inlining these.

Docker integration:
- Dockerfile updated to install proofmode gem from docker/zammad/gems/
- setup.rb updated to handle MediaVerify package lifecycle

https://claude.ai/code/session_01GJYbRCFFJCJDAEcEVbD36N

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Claude 2026-02-15 13:56:57 +00:00

parent c40d7d056e

commit 33375c9221

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