test(i18n): add translated page CRUD locale validation coverage

packages/db/prisma/migrations/20260212220000_page_translations/migration.sql

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+-- CreateTable
+CREATE TABLE "PageTranslation" (
+    "id" TEXT NOT NULL,
+    "pageId" TEXT NOT NULL,
+    "locale" TEXT NOT NULL,
+    "title" TEXT NOT NULL,
+    "summary" TEXT,
+    "content" TEXT NOT NULL,
+    "seoTitle" TEXT,
+    "seoDescription" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "PageTranslation_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "PageTranslation_locale_idx" ON "PageTranslation"("locale");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "PageTranslation_pageId_locale_key" ON "PageTranslation"("pageId", "locale");
+
+-- AddForeignKey
+ALTER TABLE "PageTranslation" ADD CONSTRAINT "PageTranslation_pageId_fkey" FOREIGN KEY ("pageId") REFERENCES "Page"("id") ON DELETE CASCADE ON UPDATE CASCADE;