Remove dynamic form builder and complete RoundProject→roundId migration

Major cleanup and schema migration:
- Remove unused dynamic form builder system (ApplicationForm, ApplicationFormField, etc.)
- Complete migration from RoundProject junction table to direct Project.roundId
- Add sortOrder and entryNotificationType fields to Round model
- Add country field to User model for mentor matching
- Enhance onboarding with profile photo and country selection steps
- Fix all TypeScript errors related to roundProjects references
- Remove unused libraries (@radix-ui/react-toast, embla-carousel-react, vaul)

Files removed:
- admin/forms/* pages and related components
- admin/onboarding/* pages
- applicationForm.ts and onboarding.ts routers
- Dynamic form builder Prisma models and enums

Schema changes:
- Removed ApplicationForm, ApplicationFormField, OnboardingStep, ApplicationFormSubmission, SubmissionFile models
- Removed FormFieldType and SpecialFieldType enums
- Added Round.sortOrder, Round.entryNotificationType
- Added User.country

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

prisma/seed-jury-demo.ts

@@ -64,14 +64,13 @@ async function main() {
 
   console.log(`Voting window: ${votingStart.toISOString()} → ${votingEnd.toISOString()}\n`)
 
-  // Get some projects to assign (via RoundProject)
-  const roundProjects = await prisma.roundProject.findMany({
+  // Get some projects to assign
+  const projects = await prisma.project.findMany({
     where: { roundId: round.id },
     take: 8,
-    orderBy: { addedAt: 'desc' },
-    select: { project: { select: { id: true, title: true } } },
+    orderBy: { createdAt: 'desc' },
+    select: { id: true, title: true },
   })
-  const projects = roundProjects.map(rp => rp.project)
 
   if (projects.length === 0) {
     console.error('No projects found! Run seed-candidatures first.')