refactor(vr_ticket): Admin.php root pattern → Hook-based goods save
- DELETE old Admin.php root controller (Vrticket.php)
- DELETE old Layui view files (seat_template/ticket/venue/verification/verifier)
- ADD hook/AdminGoodsSave.php: plugins_view_admin_goods_save hook (Vue3 form injection)
- ADD hook/AdminGoodsSaveHandle.php: handle save flow (save_handle + save_thing_end)
- UPDATE config.json: register 3 new hooks
- UPDATE SeatSkuService.php: refactored BatchGenerate
- ADD data.db: SQLite venue data
- UPDATE venue/save.html: venue editing form
- docs: add GOODS_ADD_HOOK_RESEARCH.md + update plan.md
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