Convert AI tagging to background job with progress tracking

- Add TaggingJob model for tracking tagging progress
- Convert batch tagging to background job processing (prevents timeouts)
- Add real-time progress polling in UI with percentage/count display
- Add admin notifications when tagging job completes or fails
- Export getTaggingSettings and getAvailableTags functions

After deployment, run: npx prisma migrate deploy

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

prisma/schema.prisma

@@ -324,6 +324,7 @@ model Program {
   learningResources LearningResource[]
   partners          Partner[]
   specialAwards     SpecialAward[]
+  taggingJobs       TaggingJob[]
 
   @@unique([name, year])
   @@index([status])
@@ -375,6 +376,7 @@ model Round {
   filteringResults  FilteringResult[]
   filteringJobs     FilteringJob[]
   assignmentJobs    AssignmentJob[]
+  taggingJobs       TaggingJob[]
 
   @@index([programId])
   @@index([status])
@@ -1125,6 +1127,41 @@ enum AssignmentJobStatus {
   FAILED
 }
 
+// Tracks progress of long-running AI tagging jobs
+model TaggingJob {
+  id               String            @id @default(cuid())
+  programId        String?           // If tagging entire program
+  roundId          String?           // If tagging single round
+  status           TaggingJobStatus  @default(PENDING)
+  totalProjects    Int               @default(0)
+  processedCount   Int               @default(0)
+  taggedCount      Int               @default(0)
+  skippedCount     Int               @default(0)
+  failedCount      Int               @default(0)
+  errorMessage     String?           @db.Text
+  errorsJson       Json?             @db.JsonB  // Array of error messages
+  startedAt        DateTime?
+  completedAt      DateTime?
+
+  createdAt        DateTime          @default(now())
+  updatedAt        DateTime          @updatedAt
+
+  // Relations (optional - can tag by program or round)
+  program Program? @relation(fields: [programId], references: [id], onDelete: Cascade)
+  round   Round?   @relation(fields: [roundId], references: [id], onDelete: Cascade)
+
+  @@index([programId])
+  @@index([roundId])
+  @@index([status])
+}
+
+enum TaggingJobStatus {
+  PENDING
+  RUNNING
+  COMPLETED
+  FAILED
+}
+
 // =============================================================================
 // SPECIAL AWARDS SYSTEM
 // =============================================================================