Domain model (v2.6): suppliers.category_id NOT NULL (1:N from the 8 fixed
categories), materials are global and link to suppliers via
supplier_materials. This fixes three regressions of the old inverted tree:
- remove the intermediate 'یک متریال را انتخاب کنید' screen: a category
card now routes straight to that category's supplier list
(/suppliers/category/:category); TopicPage is deleted and legacy
/topics/:topic[/:category] URLs redirect to the new hierarchy
- kill the accidental-category bug: api.materials.create silently POSTed
/material-categories for any unknown 'category' (a material name!), which
is how the rogue «پریز» category (+ junk material) appeared. Unknown
categories now fail loudly instead of creating catalog rows (DB cleaned:
exactly the 8 canonical categories remain)
- fix inverted wording: supplier list is «تأمینکنندههای این دسته» with
category-first breadcrumbs; the legacy material multi-select on the
add-supplier form is gone (a supplier gets the page's category)
- supplier details screen logic untouched — only its breadcrumb link
targets were updated to the new routes
ali_mohaghegh
f9ec68815e