Completed deadlines were irreversible — accidental completions could not be
undone. Adds a symmetric reopen path for global admins and project leads.
Server:
- PATCH /api/deadlines/{id}/reopen flips status back to pending and clears
completed_at, audit-logged as project_event kind 'deadline_reopened'.
- DeadlineService.Reopen mirrors Complete shape; new
assertCanAdminProject helper gates on global users.role='admin' OR
paliad.project_teams.role IN ('admin','lead') walking the project path.
- Service test (skipped without TEST_DATABASE_URL) covers admin + non-admin
paths and idempotent no-op.
UI:
- /deadlines/{id} detail: Wieder öffnen / Reopen button replaces the
disabled completed-state Erledigt button (admin/partner only).
- /deadlines list: per-row ↻ icon for completed rows (admin/partner only;
project-lead-only users use the detail page).
- i18n: fristen.detail.reopen, fristen.action.reopen,
dashboard.action.deadline_reopened (DE + EN).
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