feat: extend notification system with batch sender, bulk dialog, and logging

Add NotificationLog schema extensions (nullable userId, email, roundId,
projectId, batchId fields), batch notification sender service, and bulk
notification dialog UI. Include utility scripts for debugging and seeding.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

prisma/migrations/20260304111008_extend_notification_log/migration.sql

@@ -0,0 +1,31 @@
+-- DropForeignKey
+ALTER TABLE "NotificationLog" DROP CONSTRAINT "NotificationLog_userId_fkey";
+
+-- AlterTable
+ALTER TABLE "NotificationLog" ADD COLUMN     "batchId" TEXT,
+ADD COLUMN     "email" TEXT,
+ADD COLUMN     "projectId" TEXT,
+ADD COLUMN     "roundId" TEXT,
+ALTER COLUMN "userId" DROP NOT NULL,
+ALTER COLUMN "channel" SET DEFAULT 'EMAIL';
+
+-- CreateIndex
+CREATE INDEX "NotificationLog_roundId_type_idx" ON "NotificationLog"("roundId", "type");
+
+-- CreateIndex
+CREATE INDEX "NotificationLog_projectId_idx" ON "NotificationLog"("projectId");
+
+-- CreateIndex
+CREATE INDEX "NotificationLog_batchId_idx" ON "NotificationLog"("batchId");
+
+-- CreateIndex
+CREATE INDEX "NotificationLog_email_idx" ON "NotificationLog"("email");
+
+-- AddForeignKey
+ALTER TABLE "NotificationLog" ADD CONSTRAINT "NotificationLog_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "NotificationLog" ADD CONSTRAINT "NotificationLog_roundId_fkey" FOREIGN KEY ("roundId") REFERENCES "Round"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "NotificationLog" ADD CONSTRAINT "NotificationLog_projectId_fkey" FOREIGN KEY ("projectId") REFERENCES "Project"("id") ON DELETE SET NULL ON UPDATE CASCADE;

prisma/schema.prisma

@@ -638,6 +638,7 @@ model Project {
   deliberationVotes     DeliberationVote[]
   deliberationResults   DeliberationResult[]
   submissionPromotions  SubmissionPromotionEvent[]
+  notificationLogs      NotificationLog[]
 
   @@index([programId])
   @@index([status])
@@ -931,22 +932,34 @@ model AIUsageLog {
 
 model NotificationLog {
   id         String              @id @default(cuid())
-  userId     String
-  channel    NotificationChannel
+  userId     String?
+  channel    NotificationChannel @default(EMAIL)
   provider   String? // META, TWILIO, SMTP
-  type       String // MAGIC_LINK, REMINDER, ANNOUNCEMENT, JURY_INVITATION
+  type       String // MAGIC_LINK, REMINDER, ANNOUNCEMENT, JURY_INVITATION, ADVANCEMENT_NOTIFICATION, etc.
   status     String // PENDING, SENT, DELIVERED, FAILED
   externalId String? // Message ID from provider
   errorMsg   String?             @db.Text
 
+  // Bulk notification tracking
+  email     String? // Recipient email address
+  roundId   String?
+  projectId String?
+  batchId   String? // Groups emails from same send operation
+
   createdAt DateTime @default(now())
 
   // Relations
-  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+  user    User?    @relation(fields: [userId], references: [id], onDelete: SetNull)
+  round   Round?   @relation(fields: [roundId], references: [id], onDelete: SetNull)
+  project Project? @relation(fields: [projectId], references: [id], onDelete: SetNull)
 
   @@index([userId])
   @@index([status])
   @@index([createdAt])
+  @@index([roundId, type])
+  @@index([projectId])
+  @@index([batchId])
+  @@index([email])
 }
 
 // =============================================================================
@@ -2233,6 +2246,7 @@ model Round {
   evaluationSummaries   EvaluationSummary[]
   evaluationDiscussions EvaluationDiscussion[]
   messages              Message[]
+  notificationLogs      NotificationLog[]
   cohorts               Cohort[]
   liveCursor            LiveProgressCursor?