👔 feat: add banner priority ordering logic

prisma/migrations/20260302155255_add_order_in_hero_banner/migration.sql

@@ -0,0 +1,11 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[order]` on the table `hero_banner` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- AlterTable
+ALTER TABLE "hero_banner" ADD COLUMN     "order" INTEGER;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "hero_banner_order_key" ON "hero_banner"("order");