Add voice transcription admin review flow

prisma/migrations/6_add_voice_audio_and_admin_flag/migration.sql

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+-- AlterTable
+ALTER TABLE "User" ADD COLUMN     "isAdmin" BOOLEAN NOT NULL DEFAULT false;
+
+-- AlterTable
+ALTER TABLE "VoiceExperience" ADD COLUMN     "audioAccessToken" TEXT,
+ADD COLUMN     "audioContentBase64" TEXT,
+ADD COLUMN     "audioMimeType" TEXT;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "VoiceExperience_audioAccessToken_key" ON "VoiceExperience"("audioAccessToken");