Implement 15 platform features: digest, availability, templates, comparison, live voting SSE, file versioning, mentorship, messaging, analytics, drafts, webhooks, peer review, audit enhancements, i18n

Features implemented:
- F1: Email digest notifications with cron endpoint and per-user frequency
- F2: Jury availability windows and workload preferences in smart assignment
- F3: Round templates with save-from-round and CRUD management
- F4: Side-by-side project comparison view for jury members
- F5: Real-time voting dashboard with Server-Sent Events (SSE)
- F6: Live voting UX: QR codes, audience voting, tie-breaking, score animations
- F7: File versioning, inline preview, bulk download with presigned URLs
- F8: Mentor dashboard: milestones, private notes, activity tracking
- F9: Communication hub with broadcasts, templates, and recipient targeting
- F10: Advanced analytics: cross-round comparison, juror consistency, diversity metrics, PDF export
- F11: Applicant draft saving with magic link resume and cron cleanup
- F12: Webhook integration layer with HMAC signing, retry, and delivery logs
- F13: Peer review discussions with anonymized scores and threaded comments
- F14: Audit log enhancements: before/after diffs, session grouping, anomaly detection, retention
- F15: i18n foundation with next-intl (EN/FR), cookie-based locale, language switcher

Schema: 12 new models, field additions to User, Project, ProjectFile, LiveVotingSession, LiveVote, MentorAssignment, AuditLog, Program
New routers: roundTemplate, message, webhook (registered in _app.ts)
New services: email-digest, webhook-dispatcher
New cron endpoints: /api/cron/digest, /api/cron/draft-cleanup, /api/cron/audit-cleanup
New API routes: /api/live-voting/stream (SSE), /api/files/bulk-download

All features are admin-configurable via SystemSettings or per-model settingsJson fields.
Docker build verified successfully.

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

src/app/api/cron/draft-cleanup/route.ts

@@ -0,0 +1,37 @@
+import { NextResponse } from 'next/server'
+import type { NextRequest } from 'next/server'
+import { prisma } from '@/lib/prisma'
+
+export async function GET(request: NextRequest): Promise<NextResponse> {
+  const cronSecret = request.headers.get('x-cron-secret')
+
+  if (!cronSecret || cronSecret !== process.env.CRON_SECRET) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  try {
+    const now = new Date()
+
+    // Delete projects where isDraft=true AND draftExpiresAt has passed
+    const result = await prisma.project.deleteMany({
+      where: {
+        isDraft: true,
+        draftExpiresAt: {
+          lt: now,
+        },
+      },
+    })
+
+    return NextResponse.json({
+      ok: true,
+      cleanedUp: result.count,
+      timestamp: now.toISOString(),
+    })
+  } catch (error) {
+    console.error('Cron draft cleanup failed:', error)
+    return NextResponse.json(
+      { error: 'Internal server error' },
+      { status: 500 }
+    )
+  }
+}