fix: add identifier column migration and fix entrypoint resolve logic

- Add explicit migration for CatalogItem.identifier column
- Fix entrypoint script: resolve only migrations on 'Failed' lines (not all)
- Remove auto-diff generation (use committed migration files instead)
- Remove 2>/dev/null that swallowed migration errors

prisma/migrations/20260228000000_add_catalog_item_identifier/migration.sql

@@ -0,0 +1,5 @@
+-- AlterTable
+ALTER TABLE "CatalogItem" ADD COLUMN "identifier" TEXT;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "CatalogItem_identifier_key" ON "CatalogItem"("identifier");