feat(wordcloud): 下单 WCD 派单（buildWcdPackage + dispatch + 幂等 + 订单设计关联）

prisma/migrations/20260812124858_r4_order_design_and_dispatch/migration.sql

@@ -0,0 +1,15 @@
+-- AlterTable
+ALTER TABLE "CustomizationTask" ADD COLUMN     "orderId" TEXT,
+ADD COLUMN     "wordcloudJobId" TEXT;
+
+-- AlterTable
+ALTER TABLE "Order" ADD COLUMN     "designListId" TEXT;
+
+-- CreateIndex
+CREATE INDEX "CustomizationTask_orderId_idx" ON "CustomizationTask"("orderId");
+
+-- CreateIndex
+CREATE INDEX "Order_designListId_idx" ON "Order"("designListId");
+
+-- AddForeignKey
+ALTER TABLE "Order" ADD CONSTRAINT "Order_designListId_fkey" FOREIGN KEY ("designListId") REFERENCES "DesignList"("id") ON DELETE SET NULL ON UPDATE CASCADE;