praisonai-platform: list_issue_activity returns activity log for any issue regardless of workspace ownership

Summary Type: Insecure Direct Object Reference. The GET /workspaces/workspaceid/issues/issueid/activity endpoint is gated by requireworkspacememberworkspaceid and dispatches to ActivityService.listforissueissueid, which executes SELECT FROM activity WHERE issueid = :issueid with no workspace...