feat(product-family): replace legacy good merge with family mechanism in config view and public detail

apps/api/src/goods/goods.service.ts

@@ -31,6 +31,7 @@ const GOOD_INCLUDE = {
       detail: true,
       variants: { orderBy: [{ sortOrder: 'asc' }, { id: 'asc' }] },
       _count: { select: { variants: true } },
+      family: { select: { id: true, familyCode: true, familyName: true, stale: true } },
     },
   },
   goodTags: { include: { tag: true } },
@@ -334,6 +335,18 @@ export class GoodsService {
     }
     if (dto.goodPriority !== undefined) data.goodPriority = dto.goodPriority;
     if (dto.goodImage !== undefined) data.goodImage = dto.goodImage;
+    if (dto.familyId !== undefined) {
+      if (dto.familyId !== null) {
+        const family = await this.prisma.productFamily.findUnique({
+          where: { id: BigInt(dto.familyId) },
+          select: { id: true },
+        });
+        if (!family) throw new NotFoundException(`product family ${dto.familyId} not found`);
+        data.family = { connect: { id: family.id } };
+      } else {
+        data.family = { disconnect: true };
+      }
+    }
     if (dto.tagIds !== undefined) {
       for (const tagId of dto.tagIds) {
         await this.ensureTag(tagId);