feat(api): good family_id column with backfill

apps/api/prisma/migrations/20260828053415_add_good_family_id/migration.sql

@@ -0,0 +1,14 @@
+-- AlterTable
+ALTER TABLE "goods" ADD COLUMN     "family_id" BIGINT;
+
+-- CreateIndex
+CREATE INDEX "goods_family_id_idx" ON "goods"("family_id");
+
+-- AddForeignKey
+ALTER TABLE "goods" ADD CONSTRAINT "goods_family_id_fkey" FOREIGN KEY ("family_id") REFERENCES "product_families"("family_id") ON DELETE SET NULL ON UPDATE NO ACTION;
+
+-- Backfill: Good 的族 = 其主链接所属族（派生数据，后续由服务层联动维护）
+UPDATE "goods" SET "family_id" = (
+  SELECT "o"."family_id" FROM "origin_goods" "o"
+  WHERE "o"."origin_good_id" = "goods"."origin_good_id"
+);

apps/api/prisma/schema.prisma

@@ -212,6 +212,7 @@ model Position {
 model Good {
   id           BigInt   @id @default(autoincrement()) @map("good_id")
   originGoodId BigInt   @map("origin_good_id")
+  familyId     BigInt?  @map("family_id")
   countryId    BigInt   @map("country_id")
   categoryId   BigInt   @map("category_id")
   tagId        BigInt?  @map("tag_id")
@@ -223,6 +224,7 @@ model Good {
   updatedAt    DateTime @default(now()) @updatedAt @map("updated_at") @db.Timestamptz(6)
 
   originGood OriginGood @relation(fields: [originGoodId], references: [id], onDelete: Restrict, onUpdate: NoAction)
+  family     ProductFamily? @relation(fields: [familyId], references: [id], onDelete: SetNull, onUpdate: NoAction)
   country    Country    @relation(fields: [countryId], references: [id], onDelete: Restrict, onUpdate: NoAction)
   category   Category   @relation(fields: [categoryId], references: [id], onDelete: Restrict, onUpdate: NoAction)
   tag        Tag?       @relation(fields: [tagId], references: [id], onDelete: SetNull, onUpdate: NoAction)
@@ -231,6 +233,7 @@ model Good {
   mergedOriginGoods GoodOriginGood[]
 
   @@index([originGoodId])
+  @@index([familyId])
   @@index([countryId])
   @@index([categoryId])
   @@index([tagId])
@@ -292,6 +295,7 @@ model ProductFamily {
 
   originGoods    OriginGood[]
   priceOverrides FamilyPriceOverride[]
+  goods          Good[]
   country        Country?  @relation(fields: [countryId], references: [id], onDelete: SetNull, onUpdate: NoAction)
   category       Category? @relation(fields: [categoryId], references: [id], onDelete: SetNull, onUpdate: NoAction)