feat(trash): 商品删除→垃圾桶(软删可恢复)+ 左侧垃圾桶入口

后端(无需迁移,复用 Product.status active/archived):
- destroy 改软删(status→archived);正常列表/详情只看 active
- 新增 /products/trash(列已删)、/products/{id}/restore(恢复)、/{id}/purge(彻底删)
- tests.py:软删/列表隐藏/回收站/恢复/彻底删/拒绝彻底删 active —— 5 测试全过

前端:
- api:productsTrash / restoreProduct / purgeProduct
- 左侧导航加「垃圾桶」(新增 trash 图标);route-config 接 /trash 路由
- 新页 routes/trash.tsx + trash-page.css(仅 token):已删商品列表 + 恢复 + 彻底删(二次确认)
- 删除确认文案「不可撤销」→「移至垃圾桶可恢复」;toast「商品已删除」→「已移至垃圾桶」

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

core/frontend/src/api.ts

@@ -229,8 +229,19 @@ export const api = {
     return request<Product>(`/api/products/${productId}/images/${imageId}/`, { method: "DELETE" });
   },
   deleteProduct(id: string) {
+    // 软删 = 进垃圾桶(后端 status→archived,可恢复)
     return request<void>(`/api/products/${id}/`, { method: "DELETE" });
   },
+  productsTrash() {
+    return request<Paginated<Product>>("/api/products/trash/");
+  },
+  restoreProduct(id: string) {
+    return request<Product>(`/api/products/${id}/restore/`, { method: "POST" });
+  },
+  purgeProduct(id: string) {
+    // 彻底删除(不可恢复)
+    return request<void>(`/api/products/${id}/purge/`, { method: "DELETE" });
+  },
   projects() {
     return request<Paginated<Project>>("/api/projects/");
   },