Add canManage computed (senior_editor + admin) to auth store and use it
for oil edit/delete buttons, PDF export, and public recipe section
visibility. Backend already allowed these operations for senior_editor.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Previously only editor+ roles could manage recipes, so viewer users
saw an empty "我的配方" section. Now any authenticated user can CRUD
their own recipes while admin/senior_editor retain full access.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>