adding the plan post api

prisma/migrations/20260406153500_init/migration.sql

@@ -0,0 +1,8 @@
+-- DropForeignKey
+ALTER TABLE "Account" DROP CONSTRAINT "Account_subscriptionId_fkey";
+
+-- AlterTable
+ALTER TABLE "Account" ALTER COLUMN "subscriptionId" DROP NOT NULL;
+
+-- AddForeignKey
+ALTER TABLE "Account" ADD CONSTRAINT "Account_subscriptionId_fkey" FOREIGN KEY ("subscriptionId") REFERENCES "Plan"("id") ON DELETE SET NULL ON UPDATE CASCADE;