ff32ec85c5
Gitea prefers .gitea/ISSUE_TEMPLATE/ and .gitea/workflows/ over the GitHub-convention .github/ equivalents. Moves all issue templates and workflow files to the Gitea-native paths and updates CLAUDE.md references. Cosign certificate identity paths in release/rollback workflows are intentionally left unchanged — they reference the signing identity from prior workflow runs and will need a separate update when the CI signing infrastructure migrates. Co-Authored-By: Paperclip <noreply@paperclip.ing>