fix(admin,api): always show family composition badge N条链接·M个配置

按用户反馈（PLTM006 明明能查到配置数却不显示）：左树徽标此前只在
同分类内 ≥2 个配置时才出现，单配置族一行上什么都不显示，而右树同族
链接都挂着绿色已配置徽标，两边数字对不上，反复造成「配置数没显示」
的误解。

- goods API：GOOD_INCLUDE 的 family 带 _count.originGoods，
  GoodDto.originGood.family 增加 memberCount（族成员链接数）
- admin：distinctByFamily 记录 linkCount；一族一行的徽标常显
  「N 条链接 · M 个配置」（链接数=族成员数，配置数=该族官网商品数），
  悬浮仍列出全部配置可打开
- 文档同步徽标语义

效果：PLTM006 行显示「4 条链接 · 1 个配置」（真值：4 条链接仅配了
1 个官网商品）；PLTF026 的「4 条链接 · 4 个配置」同屏可对比，其中
4 个配置为历史同国家重复配置，建议另行清理。

验证：admin vue-tsc 干净 + vitest 22/22；api goods spec 18/18；
Prisma _count 查询实测返回 originGoods=4

apps/api/src/goods/dto/good.dto.ts

@@ -13,7 +13,7 @@ export interface GoodRelations {
     goodName: string | null;
     goodImage: string | null;
     goodPrice: unknown;
-    family?: { id: bigint; familyCode: string | null; familyName: string } | null;
+    family?: { id: bigint; familyCode: string | null; familyName: string; _count?: { originGoods: number } } | null;
     detail?: {
       productCode: string | null;
       syncedAt: Date;
@@ -128,7 +128,7 @@ export class GoodDto {
     sizeRowCount: number;
     packageRowCount: number;
     productCode: string | null;
-    family?: { familyId: string; familyCode: string | null; familyName: string } | null;
+    family?: { familyId: string; familyCode: string | null; familyName: string; memberCount?: number } | null;
   } | null;
 
   static from(
@@ -223,6 +223,7 @@ export class GoodDto {
                   familyId: rel.originGood.family.id.toString(),
                   familyCode: rel.originGood.family.familyCode,
                   familyName: rel.originGood.family.familyName,
+                  memberCount: rel.originGood.family._count?.originGoods,
                 }
               : null,
           }

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

@@ -33,7 +33,15 @@ 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 } },
+      family: {
+        select: {
+          id: true,
+          familyCode: true,
+          familyName: true,
+          stale: true,
+          _count: { select: { originGoods: true } },
+        },
+      },
     },
   },
   goodTags: { include: { tag: true } },